Diabetes in dogs
Diabetes mellitus is a disease in which the beta cells of the endocrine pancreas either stop producing insulin or can no longer produce it in enough quantity for the body's needs. The condition is commonly divided into two types, depending on the origin of the condition: Type 1 diabetes, sometimes called "juvenile diabetes", is caused by destruction of the beta cells of the pancreas. The condition is also referred to as insulin-dependent diabetes, meaning exogenous insulin injections must replace the insulin the pancreas is no longer capable of producing for the body's needs. Dogs can have insulin-dependent, or Type 1, diabetes; research finds no Type 2 diabetes in dogs. Because of this, there is no possibility the permanently damaged pancreatic beta cells could re-activate to engender a remission as may be possible with some feline diabetes cases, where the primary type of diabetes is Type 2. There is another less common form of diabetes, diabetes insipidus, which is a condition of insufficient antidiuretic hormone or resistance to it.
This most common form of diabetes affects approximately 0.34% of dogs. The condition is treatable and need not shorten the animal's life span or interfere with quality of life. If left untreated, the condition can lead to cataracts, increasing weakness in the legs (neuropathy), malnutrition, ketoacidosis, dehydration, and death. Diabetes mainly affects middle-age and older dogs, but there are juvenile cases. The typical canine diabetes patient is middle-age, female, and overweight at diagnosis.
The number of dogs diagnosed with diabetes mellitus has increased three-fold in thirty years. In survival rates from almost the same time, only 50% survived the first 60 days after diagnosis and went on to be successfully treated at home. Currently, diabetic dogs receiving treatment have the same expected lifespan as non-diabetic dogs of the same age and gender.
- 1 Classification and causes
- 2 Pathogenesis
- 3 Symptoms
- 4 Management
- 5 Disease complications
- 6 Treatment complications
- 7 References
- 8 External links
Classification and causes
At present, there is no international standard classification of diabetes in dogs. Commonly used terms are:
- Insulin deficiency diabetes or primary diabetes, which refers to the destruction of the beta cells of the pancreas and their inability to produce insulin.
- Insulin resistance diabetes or secondary diabetes, which describes the resistance to insulin caused by other medical conditions or by hormonal drugs.
While the occurrence of beta cell destruction is known, all of the processes behind it are not. Canine primary diabetes mirrors Type 1 human diabetes in the inability to produce insulin and the need for exogenous replacement of it, but the target of canine diabetes autoantibodies has yet to be identified. Breed and treatment studies have been able to provide some evidence of a genetic connection. Studies have furnished evidence that canine diabetes has a seasonal connection not unlike its human Type 1 diabetes counterpart, and a "lifestyle" factor, with pancreatitis being a clear cause. This evidence suggests that the disease in dogs has some environmental and dietary factors involved.
Secondary diabetes may be caused by use of steroid medications, the hormones of estrus, acromegaly, (spaying can resolve the diabetes), pregnancy, or other medical conditions such as Cushing's disease. In such cases, it may be possible to treat the primary medical problem and revert the animal to non-diabetic status. Returning to non-diabetic status depends on the amount of damage the pancreatic insulin-producing beta cells have sustained.
It happens rarely, but it is possible for a pancreatitis attack to activate the endocrine portion of the organ back into being capable of producing insulin once again in dogs. It is possible for acute pancreatitis to cause a temporary, or transient diabetes, most likely due to damage to the endocrine portion's beta cells. Insulin resistance that can follow a pancreatitis attack may last for some time thereafter. Pancreatitis can damage the endocrine pancreas to the point where the diabetes is permanent.
Genetic susceptibility of certain breeds
This list of risk factors for canine diabetes is taken from the genetic breed study that was published in 2007. Their "neutral risk" category should be interpreted as insufficient evidence that the dog breed genetically shows a high, moderate, or a low risk for the disease. All risk information is based only on discovered genetic factors.
The body uses glucose for energy. Without insulin, glucose is unable to enter the cells where it will be used for this and other anabolic ("building up") purposes, such as the synthesis of glycogen, proteins, and fatty acids. Insulin is also an active preventor of the breakdown or catabolism of glycogen and fat. The absence of sufficient insulin causes this breaking-down process to be accelerated; it is the mechanism behind metabolizing fat instead of glucose and the appearance of ketones.
Since the glucose that normally enters the cells is unable to do so without insulin, it begins to build up in the blood where it can be seen as hyperglycemia or high blood glucose levels. The tubules of the kidneys are normally able to re-absorb glucose, but they are unable to handle and process the amount of glucose they are being presented with. At this point, which is called the renal threshold, the excess glucose spills into the urine (glycosuria), where it can be seen in urine glucose testing. It is the polyuria, or over-frequent urination, which causes polydipsia, or excessive water consumption, through an osmotic process. Even though there is an overabundance of glucose, the lack of insulin does not allow it to enter the cells. As a result, they are not able to receive nourishment from their normal glucose source. The body begins using fat for this purpose, causing weight loss; the process is similar to that of starvation.
- excessive water consumption– polydipsia
- frequent and/or excessive urination–polyuria–possible house "accidents"
- greater than average appetite–polyphagia–with either weight loss or maintenance of current weight
- cloudy eyes–Cataracts
It is possible that the illness may not be noticed until the dog has symptoms of ketosis or ketoacidosis. When newly diagnosed, about 40% of dogs have elevated ketone levels; some are in diabetic ketoacidosis when first treated for diabetes.
Early diagnosis and interventive treatment can mean reduced incidence of complications such as cataracts and neuropathy. Since dogs are insulin dependent, oral drugs are not effective for them. They must be placed on insulin replacement therapy. Approved oral diabetes drugs can be helpful to sufferers of Type 2 diabetes because they work in one of three ways: by inducing the pancreas to produce more insulin, by allowing the body to more effectively use the insulin it produces, or by slowing the glucose absorption rate from the GI tract. Unapproved so-called "natural" remedies make similar claims for their products. All of this is based on the premise of having an endocrine pancreas with beta cells capable of producing insulin. Those with Type 1, or insulin-dependent diabetes, have beta cells which are permanently damaged, thus unable to produce insulin. This is the reason nothing other than insulin replacement therapy can be considered real and effective treatment. Canine diabetes means insulin dependency; insulin therapy must be continued for life.
The goal is to regulate the pet's blood glucose using insulin and some probable diet and daily routine changes. The process may take a few weeks or many months. It is basically the same as in Type 1 diabetic humans. The aim is to keep the blood glucose values in an acceptable range. The commonly recommended dosing method is by "starting low and going slow" as indicated for people with diabetes. Typical starting insulin doses are from 0.25 IU/kg (2.2 lb) to 0.50 IU/kg (2.2 lb) of body weight.
During the initial process of regulation and periodically thereafter, the effectiveness of the insulin dose at controlling blood glucose needs to be evaluated. This is done by a series of blood glucose tests called a curve. Blood samples are taken and tested at intervals of one to two hours over a 12- or 24-hour period. The results are generally transferred into graph form for easier interpretation. They are compared against the feeding and insulin injection times for judgment. The curve provides information regarding the action of the insulin in the animal. It is used to determine insulin dose adjustments, determine lowest and highest blood glucose levels, discover insulin duration and, in the case of continued hyperglycemia, whether the cause is insufficient insulin dose or Somogyi rebound, where blood glucose levels initially reach hypoglycemic levels and are brought to hyperglycemic ones by the body's counterregulatory hormones. Curves also provide evidence of insulin resistance which may be caused by medications other than insulin or by disorders other than diabetes which further testing can help identify.
Other diagnostic tests to determine the level of diabetic control are fructosamine and glycosylated hemoglobin (GHb) blood tests which can be useful especially if stress may be a factor. While anxiety or stress may influence the results of blood or urine glucose tests, both of these tests measure glycated proteins, which are not affected by them. Fructosamine testing provides information about blood glucose control for an approximate 2- to 4-week period, while GHb tests measure a 2- to 4-month period. Each of these tests has its own limitations and drawbacks and neither are intended to be replacements for blood glucose testing and curves, but are to be used to supplement the information gained from them. While HbA1c tests are a common diagnostic for diabetes in humans, there are no standards of measurement for use of the test in animals. This means the information from them may not be reliable.
The diabetic pet is considered regulated when its blood glucose levels remain within an acceptable range on a regular basis. Acceptable levels for dogs are between 5 and 10 mmol/L or 90 to 180 mg/dL. The range is wider for diabetic animals than non-diabetics, because insulin injections cannot replicate the accuracy of a working pancreas.
The general form of this treatment is an intermediate-acting basal insulin with a regimen of food and insulin every 12 hours, with the insulin injection following the meal. The most commonly used intermediate-acting insulins are NPH, also referred to as isophane, or Caninsulin, also known as Vetsulin, a porcine Lente insulin. While the normal diabetes routine is timed feedings with insulin shots following the meals, dogs unwilling to adhere to this pattern can still attain satisfactory regulation. Most dogs do not require basal/bolus insulin injections; treatment protocol regarding consistency in the diet's calories and composition along with the established feeding and injection times is generally a suitable match for the chosen intermediate-acting insulin.
With Lantus and protamine zinc insulin (PZI) being unreliable in dogs, they are rarely used to treat canine diabetes. Bovine insulin has been used as treatment for some dogs, particularly in the UK. Pfizer Animal Health discontinued of all three types of its veterinary Insuvet bovine insulins in late 2010 and suggested patients be transitioned to Caninsulin. The original owner of the insulin brand, Schering-Plough Animal Health, contracted Wockhardt UK to produce them. Wockhardt UK has produced both bovine and porcine insulins for the human pharmaceutical market for some time.
Most of the commercially available prescription diabetes foods are high in fiber, complex carbohydrates, and have proven therapeutic results. Of primary concern is getting or keeping the animal eating, as use of the prescribed amount of insulin is dependent on eating full meals. When no meal is eaten, there is still a need for a basal dosage of insulin, which supplies the body's needs without taking food into consideration. Eating a partial meal means a reduction in insulin dose. Basal and reduced insulin dose information should be part of initial doctor–client diabetes discussions in case of need.
It is possible to regulate diabetes without any diet change. If the animal will not eat a prescribed diet, it is not in the dog's best interest to insist on it; the amount of additional insulin required because a non-prescription diet is being fed is generally between 2–4%. Semi moist foods should be avoided as they tend to contain a lot of sugars. Since dogs with diabetes are prone to pancreatitis and hyperlipidemia, feeding a low-fat food may help limit or avoid these complications. A non-prescription food with a "fixed formula" would be suitable because of the consistency of its preparation. Fixed formula foods contain precise amounts of their ingredients so batches or lots do not vary much if at all. "Open formula" foods contain the ingredients shown on the label but the amount of them can vary, however they must meet the guaranteed analysis on the package. These changes may have an effect on the control of diabetes. Prescription foods are fixed formulas, while most non-prescription ones are open formula unless the manufacturer states otherwise.
Glucometers and urine test strips
The use of an inexpensive glucometer and blood glucose testing at home can help avoid dangerous insulin overdoses and can provide a better picture of how well the condition is managed. Dr. Sara Ford gave a presentation about the need for home blood glucose testing in diabetic pets at the 2010 American Veterinary Medical Association Convention. She believes a diabetic pet needs to be checked at least twice a day, saying, "If you're a human diabetic you monitor your blood sugar between 4-6 times a day. I believe that state-of-the-art care in veterinary medicine in 2010 includes home blood-glucose monitoring."
A 2003 study of canine diabetes caregivers who were new to testing blood glucose at home found 85% of them were able to both succeed at testing and to continue it on a long-term basis. Using only one blood glucose reading as the reason for an insulin dose increase is to be avoided; while the results may be higher than desired, further information, such as the lowest blood glucose reading or nadir, should be available to prevent possible hypoglycemia.
Urine strips are not recommended to be used as the sole factor for insulin adjustments as they are not accurate enough. Urine glucose testing strips have a negative result until the renal threshold of 10 mmol/L or 180 mg/dL is reached or exceeded for a period of time. The range of negative reading values is quite wide-covering normal or close to normal blood glucose values with no danger of hypoglycemia (euglycemia) to low blood glucose values (hypoglycemia) where treatment would be necessary. Because urine is normally retained in the bladder for a number of hours, the results of urine testing are not an accurate measurement of the levels of glucose in the bloodstream at the time of testing.
Glucometers made for humans are generally accurate using canine and feline blood except when reading lower ranges of blood glucose (<80 mg/dL), (<4.44 mmol/L). It is at this point where the size difference in human vs animal red blood cells can create inaccurate readings. Glucometers for humans were successfully used with pets long before animal-oriented meters were produced. A 2009 study directly compared readings from both types of glucometers to those of a chemistry analyzer. Neither glucometer's readings exactly matched those of the analyzer, but the differences of both were not clinically significant when compared to analyzer results. All glucometer readings need to be compared to same sample laboratory values to determine accuracy.
Blood glucose guidelines
even without visible hypoglycemia symptoms. Immediate treatment is needed.
The kidneys are unable to reabsorb it all; corresponding diabetic symptoms appear.
Dogs can form cataracts at this level and need to be checked for ketones using urine strips.
Higher blood glucose levels indicate a lack of sufficient insulin.
The body can switch from using ketones instead of glucose for fuel.
High blood glucose values increase the risk of the body switching to using ketones for energy.
As blood glucose values increase, so does the possibility for ketone production.
Both short and long-term ill effects are possible-see hyperglycemia for details.
Ketones – ketoacidosis
|Ketone Monitoring Needed:|
|High blood sugar|
|over 14 mmol/L or 250 mg/dL|
|skin does not snap back into place quickly
after being gently pinched; gums are tacky or dry
|Not eating for over 12 hours|
|Infection or illness||High stress levels|
|Breath smells like acetone (nail-polish remover) or fruit.|
Ketones in the urine or blood, as detected by urine strips or a blood ketone testing meter, may indicate the beginning of diabetic ketoacidosis (DKA), a dangerous and often quickly fatal condition caused by high glucose levels (hyperglycemia) and low insulin levels combined with certain other systemic stresses. DKA can be arrested if caught quickly.
Ketones are produced by the liver as part of fat metabolism and are normally not found in sufficient quantity to be measured in the urine or blood of non-diabetics or well-controlled diabetics. The body normally uses glucose as its fuel and is able to do so with sufficient insulin levels. When glucose is not available as an energy source because of untreated or poorly treated diabetes and some other unrelated medical conditions, it begins to use fat for energy instead. The result of the body turning to using fat instead of glucose for energy means ketone production that is measurable when testing either urine or blood for them.
Ketone problems that are more serious than the "trace or slight" range need immediate medical attention; they cannot be treated at home. Veterinary care for ketosis/ketoacidosis can involve intravenous (IV) fluids to counter dehydration, when necessary, to replace depleted electrolytes, intravenous or intramuscular short-acting insulin to lower blood glucose levels, and measured amounts of glucose or force feeding, to bring the metabolism back to using glucose instead of fat as its source of energy.
When testing urine for ketones, the sample needs to be as fresh as possible. Ketones evaporate quickly, so there is a chance of getting a false negative test result if testing older urine. The urine testing strip bottle has instructions and color charts to illustrate how the color on the strip will change given the level of ketones or glucose in the urine over 15 (ketones–Ketostix) or 30 (glucose–Ketodiastix) seconds. Reading the colors at those time intervals is important because the colors will continue to darken and a later reading will be an incorrect result. Timing with a clock or watch second hand instead of counting is more accurate.
At present, there is only one glucometer available for home use that tests blood for ketones using special strips for that purpose–Abbott's Precision Xtra. This meter is known as Precision, Optium, or Xceed outside of the US. The blood ketone test strips are very expensive; prices start at about US$50 for ten strips. It is most likely urine test strips–either ones that test only for ketones or ones that test for both glucose and ketones in urine would be used. The table above is a guide to when ketones may be present.
Nonketotic hyperosmolar syndrome
Nonketotic hyperosmolar syndrome (also known as hyperglycemic hyperosmolar syndrome) is a rare but extremely serious complication of untreated canine diabetes, which is a medical emergency. It shares the symptoms of extreme hyperglycemia, dehydration, and lethargy with ketoacidosis; because there is some insulin in the system, the body does not begin to turn to using fat as its energy source and there is no ketone production. There is not sufficient insulin available to the body for proper uptake of glucose, but there is enough to prevent ketone formation. The problem of dehydration in NHS is more profound than in diabetic ketoacidosis. Seizures and coma are possible. Treatment is similar to that of ketoacidosis, with the exceptions being that NHS requires that the blood glucose levels and rehydration be normalized at a slower rate than for DKA; cerebral edema is possible if the treatment progresses too rapidly.
|Clinical Signs of Dehydration |
|Based on percentage of body weight, not percentage of fluid loss|
|< 5% (mild)||not detectable|
|5–6% (moderate)||slight loss of skin elasticity|
|definite loss of skin elasticity||slight prolongation of capillary refill|
|slight sinking of eyes into orbit||slight dryness of oral mucous membranes|
|tented skin stands in place|
|prolonged capillary refill||eyes sunken in orbits|
|dry mucous membranes||possible signs of shock|
|12–15% signs of hypovolemic shock, death–emergency|
Body fluid loss is measured in two major ways–sensible and insensible. Sensible is defined as being able to be measured in some way; vomiting, urination and defecation are all considered to be sensible losses as they have the ability to be measured. An insensible loss example is breathing because while there are some fluid losses, it is not possible to measure the amount of them. With a condition like fever, it is possible to measure the amount of fluid losses from it with a formula that increases by 7% for each degree of above normal body temperature, so it would be classed as a sensible loss.
A check of the pet's gums and skin can indicate dehydration; gums become tacky and dry and skin does not snap back quickly when pinched if dehydration is present. When the skin at the back is lifted, a dehydrated animal's does not fall back into place quickly. Serious dehydration (loss of 10–12% of body fluids) means the pulled up skin stays there and does not go back into place. At this point, the animal may go into shock; dehydration of 12% or more is an immediate medical emergency. Hypovolemic shock is a life-threatening medical condition in which the heart is unable to pump sufficient blood to the body, due to loss of fluids.
Dehydration can change the way subcutaneous insulin is absorbed, so either hyperglycemia or hypoglycemia are possible; dehydration can also cause false negative or positive urine ketone test results. Hyperglycemia means more of a risk for dehydration.
Hypoglycemia, or low blood glucose, can happen even with care, since insulin requirements can change without warning. Some common reasons for hypoglycemia include increased or unplanned exercise, illness, or medication interactions, where another medication potentiates the effects of the insulin. Vomiting and diarrhea episodes can bring on a hypoglycemia reaction, due to dehydration or simply a case of too much insulin and not enough properly digested food. Symptoms of hypoglycemia need to be taken seriously and addressed promptly. Since serious hypoglycemia can be fatal, it is better to treat a suspected incident than to fail to respond quickly to the signs of actual hypoglycemia. Dr. Audrey Cook addressed the issue in her 2007 article on diabetes mellitus: "Hypoglycemia is deadly; hyperglycemia is not. Owners must clearly understand that too much insulin can kill, and that they should call a veterinarian or halve the dose if they have any concerns about a pet's well-being or appetite. Tell owners to offer food immediately if the pet is weak or is behaving strangely."
- depression or lethargy
- confusion or dizziness
- ataxia (loss of coordination or balance)
- loss of excretory or bladder control (sudden house accident)
- vomiting, and then loss of consciousness and possible seizures
Successful home treatment of a hypoglycemia event depends on being able to recognize the symptoms early and responding quickly with treatment. Trying to make a seizing or unconsicous animal swallow can cause choking on the food or liquid. There is also a chance that the materials could be aspirated (enter the lungs instead of being swallowed). Seizures or loss of consciousness because of low blood glucose levels are medical emergencies.
Food should be offered at the first signs of possible hypoglycemia. If the animal refuses it, a sugar solution (corn syrup, honey, pancake syrup, etc.) should be poured on the finger and rubbed on its gums or under the tongue (sublingually). The solution must be applied this way to prevent possible aspiration of it. Intervet suggests one tablespoon of a sugar solution rubbed onto the gums, regardless of the size of the dog. Another hypoglycemia formula is 1 gram of glucose for every kilogram (2.2 lb) of the animal's body weight. Since sugar acts quickly, a response should be seen within a minute or two.
Honey, syrup, or sugar, as simple carbohydrates, act rapidly and will make the blood glucose rise, but the rise will not last very long, as they are broken down quickly by the body. Feeding something containing complex carbohydrates when the pet is able to eat will make sure another hypoglycemia event does not overtake the rapid rise in blood glucose levels from the sugar solution. Complex carbohydrates take longer to be broken down by the body, so they do not raise blood glucose levels until some time after being eaten. A small meal should be fed and the animal taken for medical evaluation to determine if further treatment is needed. Treatment of a serious hypoglycemia episode is similar to that of diabetic humans: using glucose or glucagon infusions, depending on severity.
- Alberti, KGMM; Aschner, P.; et al. (1999). "Definition, Diagnosis and Classification of Diabetes Mellitus". World Health Organization. Retrieved 17 March 2010.
- Vetsulin. "Difference Between Type 1 and Type 2 Diabetes". Intervet. Archived from the original on March 24, 2013. Retrieved 17 March 2010.
- Catchpole, B.; Ristic, J. M.; Fleeman, L. M.; Davison, L. J. (8 September 2005). "Canine diabetes mellitus: can old dogs teach us new tricks?". Diabetologia. 48 (10): 1948–1956. doi:10.1007/s00125-005-1921-1.
- Greco, Deborah. "Ask Dr. Greco". BD Diabetes. Retrieved 17 March 2010.
- Rand, Jacqueline; Marshall, Rhett (2005). "Understanding Feline Diabetes Mellitus". Centre for Companion Animal Health, School of Veterinary Science, The University of Queensland, Brisbane, Australia. Retrieved 17 March 2010.
- "Diabetes Insipidus". Merck Veterinary Manual. Retrieved 1 June 2011.
- "Diabetes Insipidus". ProVet UK. Retrieved 2 November 2011.
- Mattin, M.; O'Neill, D.; Church, D.; McGreevy, P. D.; Thomson, P. C.; Brodbelt, D. (5 April 2014). "An epidemiological study of diabetes mellitus in dogs attending first opinion practice in the UK". Veterinary Record. 174 (14): 349–349. doi:10.1136/vr.101950.
- Pet Diabetes Month. "Lifespan of Diabetic Dogs". Intervet. Retrieved 17 March 2010.
- "Diabetic neuropathy". Merck Veterinary Manual. Retrieved 8 April 2011.
- Vetsulin. "Pathogenesis-page 3" (PDF). Intervet. Archived from the original on February 27, 2012. Retrieved 17 March 2010. (PDF)
- Foster, Race. "Juvenile Onset Diabetes Mellitus (Sugar Diabetes) in Dogs & Puppies". Drs. Foster & Smith-Pet Education. Retrieved 17 March 2010.
- Bruyette, David (2001). "Diabetes Mellitus: Treatment Options". World Small Animal Veterinary Association (WSAVA). Retrieved 17 March 2010.
- Fleeman, Linda; Rand, Jacqueline (2005). "Beyond Insulin Therapy: Achieving Optimal Control in Diabetic Dogs". Centre for Companion Animal Health, School of Veterinary Science, The University of Queensland, Brisbane, Australia. Retrieved 17 March 2010.
- "Canine Etiology". Intervet. Retrieved 20 June 2011.
- Short, Andrea D.; Catchpole, B.; Kennedy, Lorna J.; Barnes, Annette; Fretwell, Neale; Jones, Chris; Thomson, Wendy; Ollier, William E.R. (4 July 2007). "Analysis of Candidate Susceptibility Genes in Canine Diabetes". Journal of Heredity. Retrieved 20 June 2011.
- Fall, T.; Hamlin, H.H.; Hedhammar, Å.; Kämpe, O.; Egenvall, A. (November–December 2007). "Diabetes mellitus in a population of 180,000 insured dogs: incidence, survival, and breed distribution". Journal of Veterinary Internal Medicine. 21: 1209–1216. doi:10.1111/j.1939-1676.2007.tb01940.x.
- Catchpole B, Kennedy LJ, Davison LJ, Ollier WE (January 2008). "Canine diabetes mellitus: from phenotype to genotype". J Small Anim Pract. The Journal of Small Animal Practice. 49 (1): 4–10. doi:10.1111/j.1748-5827.2007.00398.x. PMID 17617163.
- Short, A.D., Saleh, N.M., Catchpole, B., Kennedy, L.J., Barnes, A., Jones, C.A., Fretwell, N., Ollier. W.E. (March 2010). "CTLA4 promoter polymorphisms are associated with canine diabetes mellitus". Tissue Antigens. Tissue Antigens. 75 (3): 242–52. doi:10.1111/j.1399-0039.2009.01434.x. PMID 20196832.
- Hess, Rebecka S.; Kass, Philip H.; Ward, Cynthia R. (1 May 2000). "Breed distribution of dogs with diabetes mellitus admitted to a tertiary care facility". Journal of the American Veterinary Medical Association. Retrieved 20 June 2011.
- Armstrong, P. Jane (2011). "Canine Pancreatitis: Diagnosis and Management" (PDF). Western Veterinary Conference. Archived from the original on March 29, 2016.
- Rand, Jacqueline; Fleeman, Linda; et al. (2004). "Canine and Feline Diabetes Mellitus: Nature or Nurture?". Centre for Companion Animal Health, School of Veterinary Science, The University of Queensland, Brisbane, Australia. Retrieved 17 April 2010.
- Davison, L.J.; Herrtage, M.E.; Catchpole, B. (9 April 2005). "Study of 253 dogs in the United Kingdom with diabetes mellitus". Vet. Rec. The Veterinary Record. 156 (15): 467–71. PMID 15828742.
- Atkins, C.E.; MacDonald, M.J. (June 1987). "Canine diabetes mellitus has a seasonal incidence: implications relevant to human diabetes". Diabetes Res. Diabetes Research (Edinburgh, Scotland). 5 (2): 83–7. PMID 3652619.
- Fall, T., Hedhammar, Å., Wallberg, Fall, A.N., Ahlgren, K.M., Hamlin, H.H., Lindblad-Toh, K., Andersson, G., Kämpe, O. (November–December 2010). "Diabetes Mellitus in Elkhounds Is Associated with Diestrus and Pregnancy". Journal of Veterinary Internal Medicine. 24: 1322–1328. doi:10.1111/j.1939-1676.2010.0630.x.
- Fall, T.; Johansson Kreuger, S.; Juberget, Å.; Bergström, A.; Hedhammar, Å. (November–December 2008). "Gestational Diabetes Mellitus in 13 Dogs". Journal of Veterinary Internal Medicine. 22: 1296–1300. doi:10.1111/j.1939-1676.2008.0199.x.
- Poppl. A. G., Mottin, T. S., Gonzalez, F. H. D. (June 2013). "Diabetes mellitus remission after resolution of inflammatory and progesterone-related conditions in bitches". Research in Veterinary Science. 94: 471–3. doi:10.1016/j.rvsc.2012.10.008. PMID 23164637.
- Scott-Moncrieff, Catherine (2009). "Canine & Feline Diabetes Mellitus I" (PDF). Western Veterinary Conference. Archived from the original on March 29, 2016.
- "Hormones Which Raise or Lower Blood Glucose". Chronolab. Archived from the original on March 6, 2012. Retrieved 1 December 2010.
- Feeney, Clara (September 2007). "How Do You Solve a Problem Like Diabetes?" (PDF). Irish Veterinary Journal. 60 (9): 548–552. Archived from the original on March 29, 2016.
- Davidson, Gigi (2000). "Providing Care for Veterinary Diabetic Patients-Canine Diabetes" (PDF). International Journal of Pharmaceutical Compounding. Archived from the original on March 29, 2016.
- Herrtage, Michael (2009). "New Strategies in the Management of Canine Diabetes Mellitus". World Small Animal Veterinary Association (WSAVA). Retrieved 17 April 2010.
- Richards, Mike. "Vet Info 4 Dogs--"Diabetes with rebound hyperglycemia" Question". Richards, Mike. Retrieved 17 March 2010.
- Schermerhorn, Thomas. "Hyperglycemia in Diabetic Dogs and Cats" (PDF). Compendium Standards of Care: 7–16. Archived from the original on March 29, 2016.
- Short, Andrea D.; Catchpole, B.; Kennedy, Lorna J.; Barnes, Annette; Fretwell, Neale; Jones, Chris; Thomson, Wendy; Ollier, William E.R. (4 July 2007). "Analysis of Candidate Susceptibility Genes in Canine Diabetes-Breed List". Journal of Heredity. Retrieved 20 June 2011.
- Short, Andrea D., Catchpole, B., Holder, AL, Ollier, William E.R,, Kennedy, LJ (21 December 2012). "Genetics of canine diabetes mellitus: are the diabetes susceptibility genes identified in humans involved in breed susceptibility to diabetes mellitus in dogs?". Veterinary Journal. 195: 139–47. doi:10.1016/j.tvjl.2012.11.013. PMID 23265864.
- Callejas, David; Mann, Christopher J.; Ayuso, Eduard; Lage, Ricardo; Grifoll, Iris; Roca, Carles; Andaluz, Anna; Ruiz-de Gopegui, Rafael; Montané, Joel; Muñoz, Sergio; Ferre, Tura; Haurigot, Virginia; Zhou, Shangzhen; Ruberte, Jesús; Mingozzi, Federico; High, Katherine A.; Garcia, Felix; Bosch, Fatima (May 2013). "Treatment of Diabetes and Long-Term Survival After Insulin and Glucokinase Gene Therapy". American Diabetes Association. doi:10.2337/db12-1113. Retrieved 14 December 2013.
- Niessen SJ, Fernandez-Fuente, M., Mahmoud, A., Campbell, S. C., Aldibbiat, A., Huggins, C., Brown, A. E., Holder, A., Piercy, R. J., Catchpole, B., Shaw, J. A., Church, David B. (July 2012). "Novel diabetes mellitus treatment: mature canine insulin production by canine striated muscle through gene therapy". Domestic Animal Endocrinology. 43: 16–25. doi:10.1016/j.domaniend.2012.01.006. PMID 22405830.
- Nussey, S.; Whitehead, S., eds. (2001). Endocrinology: An Integrated Approach. BIOS Scientific Publications. Retrieved 22 June 2011.
- Grooters, Amy M., (April 1999). "Insulin is essential for many metabolic processes". North American Veterinary Conference. Archived from the original on 30 June 2007. Retrieved 22 June 2011.
- Dean, L.; McEntyre, J., eds. (2004). The Genetic Landscape of Diabetes. National Center for Biotechnology Information (US). Retrieved 22 June 2011.
- Merck Veterinary Manual. "Diabetes Mellitus". Merck. Retrieved 17 March 2010.
- Taylor, Judith A. (2006). "Harvesting the Gold-Urinalysis". District of Columbia Academy of Veterinary Medicine. Archived from the original on April 2, 2011. Retrieved 22 June 2011.
- "Cataracts". American College of Veterinary Ophthalmologists. Retrieved 17 August 2010.
- Rucinsky, Renee; et al. (2010). "AAHA Diabetes Management Guidelines for Dogs and Cats" (PDF). American Animal Hospital Association. Archived from the original on March 5, 2012. Retrieved 21 May 2010. (PDF)
- Pet Diabetes Month. "Diagnosis and Detection". Intervet. Retrieved 17 March 2010.
- Meisler, Sam. "Diabetes in Dogs". YouTube.
- Plummer, Caryn E.; Specht, Andrew; Gelatt, Kirk N. (December 2007). "Ocular Manifestations of Endocrine Disease". Compendium. 29 (12): 733–743. PMID 18225637.
- "Ophthalmology Clinical Trial: Medical Treatment for Cataracts in Diabetic Dogs". Iowa State University School of Veterinary Medicine. Archived from the original on May 12, 2011. Retrieved 16 May 2011.
- Bromberg, Nancy M. (2008). "Diabetes and the Eye" (PDF). Southpaws. Archived from the original on March 29, 2016. Retrieved 16 May 2011. (PDF)
- Daydrell-Hart, Betsy (1999). "Peripheral Neuropathy". Southpaws. Archived from the original on January 31, 2009. Retrieved 16 May 2011.
- Brooks, Wendy C. "Insulin Alternatives". Veterinary Partner. Retrieved 17 March 2010.
- BD Diabetes. "Diet for Diabetic Dogs, and Exercise Tips". BD Diabetes. Retrieved 17 March 2010.
- "Insulin Alternatives". MarVista Vet. Archived from the original on March 27, 2009. Retrieved 19 April 2011.
- "'Miracle' Health Claims: Add a Dose of Skepticism". US Federal Trade Commission. Archived from the original on March 8, 2016. Retrieved 11 June 2010.
- "Nutriceutical, Alternative and Complementary Therapies". Ohio State University. Archived from the original on 1 January 2004. Retrieved 11 June 2010.
- "When the Target Ignores the Signal". University of Utah Genetic Learning Center. Archived from the original on March 7, 2012. Retrieved 11 June 2010.
- k9diabetes.com. "What Is Regulated?". k9diabetes.com. Retrieved 17 March 2010.
- Blumer, Ian. "Dr. Ian Blumer's Practical Guide to Diabetes". Blumer, Ian. Archived from the original on 30 January 2008. Retrieved 17 March 2010.
An MD who advises his human patients to Start Low and Go Slow.
- Blumer, Ian. "Insulin Initiation". Blumer, Ian. Retrieved 17 March 2010.
=Dr. Blumer's Letter to Newly-Diagnosed Human Diabetics in His Practice
- Pediatric OnCall. "Insulin Therapy". Pediatric OnCall. Archived from the original on 8 March 2008. Retrieved 17 March 2010.
- Nelson, Richard (2006). "Selecting an Insulin for Treating Diabetes Mellitus in Dogs and Cats" (PDF). Symposium Proceedings. Ohio State University College of Veterinary Medicine: 40. Archived from the original on March 29, 2016.
- Greco, Deborah (2010). "Treatment of Diabetes Mellitus in Dogs and Cats" (PDF). Western Veterinary Conference: 2. Archived from the original on March 29, 2016.
- Bruyette, David. "Blood glucose curve interpretation". Vetstream canis. Archived from the original on 30 May 2011. Retrieved 21 July 2010.
- "Blood Glucose Curves". Intervet US. Retrieved 22 June 2011.
- "About Blood Glucose Curves". Intervet UK. Retrieved 22 June 2011.
- "Caninsulin". Intervet. Retrieved 20 May 2010.
- "Monitoring and controlling diabetes mellitus". Intervet. Retrieved 3 October 2011.
- "Fructosamine and Glycosylated Hemogloblin". Antech. January 2000. Archived from the original on February 10, 2007. Retrieved 3 October 2011.
- Bates, Hunter E.; Bain, Perry J.; Krimer, Paula M.; Latimer, Kenneth S. (2003). "Fructosamine Measurement in Diabetic Dogs and Cats". University of Georgia School of Veterinary Medicine. Archived from the original on April 4, 2012. Retrieved 3 October 2011.
- Mared, Malin (2010). "Glucose markers in healthy and diabetic bitches in different stages of the oestral cycle" (PDF). Sveriges lantbruksuniversitet (Upsala, Sweden). Archived from the original on March 29, 2016. Retrieved 3 October 2011.
- Valley Animal Hospital. "Diabetes for Dummies-Why is it Critical to Keep Glucose at 80-200". Valley Animal Hospital. Archived from the original on July 9, 2010. Retrieved 17 March 2010.
- Marso, Stephen P.; Stern, David M., eds. (2003). Diabetes and cardiovascular disease: integrating science and clinical medicine. Lippincott Williams & Wilkins. p. 226. ISBN 978-0-7817-4053-1. Retrieved 19 April 2011.
- Sereno, Robin (1 March 2010). "Regulating diabetes mellitus in dogs and cats". DVM 360. Retrieved 20 May 2010.
- Dumitriu, Severian, ed. (2001). Polymeric Biomaterials, Revised and Expanded. CRC Press. p. 1104. ISBN 0-8247-0569-6. Retrieved 16 May 2011.
- "British Pharmacopia definition of Isophane insulin". InChem. Retrieved 31 March 2011.
- Goeders LA, Esposito LA, Peterson ME (January 1987). "Absorption kinetics of regular and isophane (NPH) insulin in the normal dog". Domestic Animal Endocrinology. Retrieved 21 June 2011.
- "Caninsulin data sheet". Vetstreamcanis. Archived from the original on March 14, 2008.
- "Vetsulin overview". Intervet.
- "British Pharmacopia definition of Lente insulin (Insulin Zinc Suspension)". InChem. Retrieved 31 March 2011.
- Schall, William (2009). "Diabetes Mellitus-CVC Proceedings". DVM 360. Retrieved 17 March 2010.
- Fleeman, Linda; Rand, Jacqueline (2000). "Long-Term Management of the Diabetic Dog" (PDF). Waltham USA. Retrieved 17 April 2010. (PDF)
- Church, David B. (2001). "What Can Be Done?-Treating the Complicated Diabetic Patient". World Small Animal Veterinary Association (WSAVA). Retrieved 17 March 2010.
- "British Pharmacopia definition of Protamine Zinc Insulin". InChem. Retrieved 21 July 2010.
- Stenner, V.J.; Fleeman, Linda; Rand, Jacqueline (2004). "Comparison of The Pharmacodynamics and Pharmacokinetics of Subcutaneous Glargine, Protamine Zinc, and Lente Insulin Preparations In Healthy Dogs". Centre for Companion Animal Health, School of Veterinary Science, The University of Queensland, Brisbane, Australia. Retrieved 17 March 2010.
- "Insuvet: Presentation". National Office of Animal Health UK. Archived from the original on April 4, 2008. Retrieved 5 May 2011.
- "Insuvet: Uses". National Office of Animal Health UK. Archived from the original on April 4, 2008. Retrieved 5 May 2011.
- Church, David B.; Mooney, Carmel T.; et al. (25 November 2010). "Switching from Insuvet to Caninsulin". VioVet UK. Archived from the original on January 4, 2011. Retrieved 14 December 2010.
- "No Further Supplies of Insuvet Insulins". Veterinary Medicines Directorate-UK. Archived from the original on February 5, 2011. Retrieved 14 December 2010.
- "Schering-Plough Animal Health Contracts Wockhardt UK for Production of Its Insuvet Insulins". Wockhardt. Archived from the original on July 18, 2011. Retrieved 14 December 2010.
- "Pfizer Animal Health Adds Former Schering-Plough Products to European Portfolio". Farming UK. 11 September 2008. Archived from the original on March 10, 2012. Retrieved 14 December 2010.
- "Hypurin Bovine Neutral". Electronic Medicines Compendium UK. Retrieved 14 December 2010.
- "Hypurin Bovine Lente". Electronic Medicines Compendium UK. Retrieved 14 December 2010.
- "Hypurin Bovine Protamine Zinc". Electronic Medicines Compendium UK. Retrieved 14 December 2010.
- Cook, Audrey (2007). "Latest Management Recommendations for Cats and Dogs with Nonketotic Diabetes Mellitus". DVM 360. Retrieved 17 March 2010.
- Buffington, Tony (2004). "Food Intake in Therapy". World Small Animal Veterinary Association (WSAVA). Retrieved 17 March 2010.
- Vetsulin. "Nutrition-Dietary Control". Intervet. Retrieved 17 March 2010.
- "Dry, Semi-Moist, or Canned-What Type of Food is Best for Your Pet?". Drs. Foster & Smith-Pet Education. Retrieved 29 January 2011.
- Brooks, Wendy C. "Diet for the diabetic dog". Veterinary Partner. Retrieved 29 January 2011.
- "Canine Endocrinology". New Hope Animal Hospital. Archived from the original on 13 November 2006. Retrieved 29 January 2011.
- "At-home monitoring critical for managing diabetes in pets". American Veterinary Medical Association. 26 July 2010. Archived from the original on 16 May 2011. Retrieved 5 November 2010.
- Casella, M.; Wess, G.; Hässig, M.; Reusch, C.E. (2003). "Home monitoring of blood glucose concentration by owners of diabetic dogs-page 9" (PDF). Journal of Small Animal Practice. Archived from the original on March 15, 2012. Retrieved 28 May 2010. (PDF)
- Schermerhorn, Thomas (2008). "Strategies for monitoring diabetes mellitus in dogs". DVM 360. Retrieved 28 May 2010.
- Cook, Audrey (1 June 2010). "Reader Questions:What you want to know about diabetic regulation". DVM 360. Retrieved 21 July 2010.
- Vetsulin. "Urine Monitoring (page 15)" (PDF). Intervet. Archived from the original on March 5, 2016. Retrieved 17 March 2010. (PDF)
- Caninsulin. "Caninsulin-Dose Adjustment". Intervet. Retrieved 17 March 2010.
- Vetsulin. "Monitoring urine". Intervet. Retrieved 17 March 2010.
- "Urine Glucose". Cornell University. Archived from the original on March 4, 2013. Retrieved 25 August 2010.
- Richards, Mike. "Vet Info 4 Dogs-Regulating Insulin". Richards, Mike. Retrieved 16 June 2010.
- Levitan, Diane Monsein (2001). "Blood glucose monitoring". DVM Newsmagazine. Retrieved 9 August 2011.
- Cohen, T.; et al. (2008). "Evaluation of Six Portable Blood Glucose Meters in Dogs". AVMA 2009. American Veterinary Medical Association AVMA. 235: 276–280. doi:10.2460/javma.235.3.276.
- Brooks, Wendy C. "Diabetes Mellitus Center". Veterinary Partner. Retrieved 29 July 2010.
- Johnson, Beth M.; Fry, Michael M.; Flatland, Bente; Kirk, Claudia A. (1 December 2009). "Comparison of a human portable blood glucose meter, veterinary portable blood glucose meter, and automated chemistry analyzer for measurement of blood glucose concentrations in dogs". Journal of the American Veterinary Medical Association. Retrieved 18 June 2011.
- Chase, Peter. "Understanding Diabetes-Chapter 5, Ketone Testing (page 30)" (PDF). Barbara Davis Center for Diabetes. Retrieved 17 March 2010. (PDF)
- Durkan, Samuel (2008). "Endocrine emergencies-CVC Proceedings". DVM 360. Retrieved 17 March 2010.
- "Blood Glucose Measurement Units". Abbott Diabetes Care, Australia. Archived from the original on February 19, 2011. Retrieved 9 June 2010.
- Pierce County Animal Emergency Clinic. "Definition of Hypoglycemic values". Animal Hospital of Pierce County. Archived from the original on 12 May 2008. Retrieved 17 March 2010.
- Merck Veterinary Manual. "Biochemical References Ranges". Merck. Retrieved 17 March 2010.
- "Pathogenesis". Intervet. Retrieved 8 January 2011.
- Hanas, Ragnar (1999). "Insulin Dependent Diabetes in Children, Adolescents and Adults (page 11)" (PDF). Children With Diabetes. Retrieved 17 March 2010. (PDF)
- "Assessing Dehydration Through Skin Elasticity". Drs. Foster & Smith-Pet Education. Retrieved 17 April 2010.
- "Water: A Nutritional Requirement". Drs. Foster & Smith-Pet Education.com. Retrieved 17 April 2010.
- "Ketosis" (PDF). Novo Nordisk. Archived from the original on September 15, 2009. Retrieved 17 April 2010. (PDF)
- "Diabetes Complications-Ketoacidosis". American Diabetes Association. Retrieved 17 April 2010.
- "Blood Ketone Testing Meter--Abbott's Precision Xtra". Children With Diabetes. Archived from the original on July 8, 2011. Retrieved 17 March 2010.
- Hanas, Ragnar. "Ketones Increase With Lack of Insulin". Children With Diabetes. Archived from the original on July 8, 2011. Retrieved 17 April 2010.
- "Urine Ketones-Meanings and False Positives". Patient UK. Retrieved 17 March 2010.
- "Urine Ketones". Cornell University. Archived from the original on April 2, 2012. Retrieved 25 August 2010.
- "Hypokalemia-Low Blood Potassium". RxEd. Archived from the original on 20 August 2007. Retrieved 17 April 2010.
- Schermerhorn, Thomas (2008). "Treatment of Diabetes Mellitus in Dogs and Cats" (PDF). North American Veterinary Conference (NAVC). Archived from the original on March 29, 2016.
- Stoeppler, Melissa Conrad. "What Are Electrolytes?". MedicineNet. Retrieved 17 April 2010.
- Wortinger, Ann (February 2001). "Electrolytes, Fluids and the Acid-Base Balance" (PDF). Veterinary Technician. Archived from the original on March 29, 2016.
- Connally, H.E. (2002). "Critical Care Monitoring Considerations for the Diabetic Patient-Clinical Techniques in Small Animal Practice". Clinical techniques in small animal practice. Retrieved 17 April 2010.
- Chastain, C.B.; Nichols, C.E. (1981). "Low-dose Intramuscular Insulin Therapy for Diabetic Ketoacidosis in Dogs". Journal of the American Veterinary Medical Association. Retrieved 17 April 2010.
- Huang, Alice; Scott-Moncrieff, J. Catherine (April 2011). "Canine Ketoacidosis" (PDF). Clinician's Brief. Archived from the original on March 29, 2016.
- Sine, Cheryl S.; Krimer, Paula; et al. "Urinalysis Dipstick Interpretations". University of Georgia College of Veterinary Medicine. Archived from the original on July 7, 2011. Retrieved 17 April 2010.
- "Ketone Strips" (PDF). Diabetes Self-Management. Retrieved 17 April 2010. (PDF)
- "Abbott's Precision Xtra". Abbott Diabetes Care. Retrieved 17 March 2010.
- Di Tommaso, M.; Aste, G.; Rocconi, F.; Guglielmini, C.; Boari, A. (2009). "Evaluation of a Portable Meter to Measure Ketonemia and Comparison with Ketonuria for the Diagnosis of Canine Diabetic Ketoacidosis". Journal of Veterinary Internal Medicine. 23: 466–471. doi:10.1111/j.1939-1676.2009.0302.x.
- Abbott Diabetes Care. "Abbott's Precision/Optium/Xceed". PRNewswire. Retrieved 17 March 2010.
- "Abbott Optium Xceed". Yorkshire Diabetes. Archived from the original on 10 February 2009. Retrieved 17 March 2010.
- Abbott Diabetes Care. "Precision Xtra Blood Ketone Test Strips". Abbott Diabetes Care. Retrieved 17 April 2010.
- "Treating hyperosmolar syndrome". Intervet. Retrieved 20 June 2011.
- Macintyre, Douglass (1 August 2008). "Diabetic crises: Recognition and management (Proceedings)". DVM 360. Retrieved 20 June 2011.
- "Assessing Dehydration Status". Washington State University. Archived from the original on 24 July 2008. Retrieved 21 August 2010.
- "Hypovolemic shock". University of Maryland Medical Center. Retrieved 21 August 2010.
- "Fluid Facts". Washington State University College of Veterinary Medicine. Archived from the original on 4 September 2006. Retrieved 21 August 2010.
- "Pediatric Endocrine Emergency Answer Sheet". American College of Emergency Physicians. Archived from the original on 20 March 2007. Retrieved 21 August 2010.
- "Ketosis and Dehydration" (PDF). North American Veterinary Conference. 2003. Archived from the original on March 29, 2016.
- "Hyperglycemia". FAQS.org. Retrieved 21 August 2010.
- Vetsulin. "Emergencies-Low Blood Sugar". Intervet. Retrieved 17 April 2010.
- "Hypoglycemia". Drs. Foster & Smith Pet Education. Retrieved 17 April 2010.
- Vetsulin. "Hypoglycemia". Intervet. Retrieved 17 April 2010.
- Cat-Dog-Diabetes. "Hypoglycaemia". Intervet (UK). Retrieved 17 April 2010.
- "Hypoglycemia" (PDF). Novo Nordisk. Archived from the original on July 6, 2011. Retrieved 17 April 2010. (PDF)
- "video of Jasmine, a canine diabetic, showing signs of hypoglycemia that progress into a hypoglycemic seizure". YouTube.
- Cook, Audrey (2007). "What Clients Need to Know". DVM 360. Retrieved 17 March 2010.
- "Seizures". Washington State University College of Veterinary Medicine. Archived from the original on April 4, 2011. Retrieved 17 April 2010.
- "Pneumonia". Merck Veterinary Manual. Retrieved 19 April 2011.
- Thomas, WB. "Hypoglycemia". University of Tennessee College of Veterinary Medicine. Retrieved 17 April 2010.
- "Photo illustrating how to rub sugar solution on an animal's gums". Drs. Foster & Smith Pet Education. Retrieved 17 April 2010.
- Caninsulin. "Hypoglycemia". Intervet. Retrieved 17 April 2010.
- "Carbs Information-simple carbohydrates". Carbs Information. Retrieved 17 April 2010.
- "Hypoglycemia in Dogs". BD Diabetes. Retrieved 17 April 2010.
- "Complex Carbohydrates". Weight Loss for All. Retrieved 17 April 2010.
- "Carbs Information-complex carbohydrates". Carbs Information. Retrieved 17 April 2010.
- "Hypoglycemia" (PDF). Yorkshire Diabetes. Archived from the original on March 4, 2012. Retrieved 17 April 2010. (PDF)
- Sheafor, Sarah (2000). "Glucagon Infusions". SouthPaws. Archived from the original on June 9, 2008. Retrieved 17 November 2010.
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