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==Health==
==Health==
Tollers are generally hardy.{{cn}} However, like almost all dog breeds, certain genetic disorders are known to occur in the breed. This is sometimes blamed on a relatively small gene pool. The Finnish breed club states the largest health problems in the breed to be immunity related.<ref name="Maki (2010)"/> They can be affected by eye problems and hip dysplasia and are predisposed to immune-mediated rheumatic disease and steroid-responsive meningitis–arteritis.<ref name="Maki (2010)"/><ref>{{cite doi|10.1007/s00251-009-0387-6}}</ref>
{{refimprove section|date=June 2012}}

Tollers are generally hardy. However, like almost all dog breeds, certain [[genetic disorder]]s are known to occur in the breed. This is sometimes blamed on a relatively small [[gene pool]]. The Toller's hereditary diseases include [[Addison's disease in canines|Addison's disease]], [[progressive retinal atrophy]], and [[Hip dysplasia (canine)|hip dysplasia]].
[[Progressive retinal atrophy]] (PRA) affects about 7% of Tollers with an estimated 40% being carriers.<ref>{{cite web|title=prcd-PRA Test For: Nova Scotia Duck Tolling Retrievers|url=http://www.optigen.com/opt9_test_pra_toller.html|publisher=OptiGen|accessdate=27 August 2012}}</ref> The type of PRA associated with the breed is known as progressive rod-cone degeneration. The disease causes cells in the retina to degenerate and die, causing night blindness at first and complete blindness eventually.<ref>{{cite web|title=The OptiGen prcd-PRA Test|url=http://www.optigen.com/opt9_test_prcd_pra.html|publisher=OptiGen|accessdate=27 August 2012}}</ref> [[Collie eye anomaly]] is estimated to have a carrier rate of 5% and an affected rate of 0.5%. It generally only cause mildly impared vision but in more severe cases can lead to retinal hemorrhaging and detachments resulting in blindness.<ref>{{cite web|title=Questions and Answers about Collie Eye Anomaly in the Nova Scotia Duck Tolling Retriever|url=www.nsdtrc-usa.org/programs/health_program/cea_info.html|publisher=Club Logo Nova Scotia Duck Tolling Retriever Club (USA)|accessdate=27 August 2012}}</ref>

Thyroid problems have been identified by American breeders as a priority issue, together with epilepsy and hip dysplasia. As many as 1 in 6 Tollers may have [[autoimmune thyroiditis]]. Symptoms of thyroid problems includes weight gain, skin and hair problems including hair loss, weakness, cold intolerance or infertility.<ref>{{cite web|last=Folkman|first=Jane|title=Thyroid/Addison’s Study In Tollers – Michigan State University|url=http://www.nsdtrc-usa.org/PDF_forms/ThyroidAddisonsStudyinToller.pdf|publisher=Nova Scotia Duck Tolling Retriever Club (USA)|accessdate=27 August 2012}}</ref>

[[Addison’s disease]] affected 1% of Tollers in a health survey, an incidence rate 10 times more than the general dog population. Carrier rate is estimated at 18%. This disease is also considered an important issue in the breed. Signs can include lethargy, decreased appetite, vomiting, weakness, diarrhea, increased drinking and urinations, and shivering.<ref>{{cite web|title=Update – UC Davis Addison’s Study In Tollers|url=http://www.nsdtrc-usa.org/PDF_forms/HGC/UCDavisUpdateAMH-0806.pdf|publisher=Nova Scotia Duck Tolling Retriever Club (USA)|accessdate=27 August 2012}}</ref>

Health tests are available for both eye diseases and autoimmune thyroiditis. A test for Addison's disease is available but it is only for one form of the disease and there are other forms which also affects the breed.<ref>{{cite web|title=Explanation of JADD Testing Results|url=https://secure.offa.org/dnatesting/jaddexplanation.html|publisher=Orthopedic Foundation for Animals|accessdate=27 August 2012}}</ref>


A survey conducted in 2002 by the Canadian breed club, involving owners of 1180 dogs worldwide, showed 73% reported in excellent health and a total of 7.5% reporting poor or bad health. 141 dogs (12%) were reported as deceased with the average age at death being 6.4 years. About 1 in 5 live to 12 years and above with the oldest living to 16 years.<ref>{{cite web|title=2002 Nova Scotia Duck Tolling Retriever Health Survey|url=http://www.toller.ca/tollerhealth/SurveySummary.html|publisher=Toller Health Coalition/NSDTR Club of Canada|accessdate=June 28, 2012}}{{unreliable source|date=August 2012|reason=This is a self-reported primary source that specializes in unusual early mortality.}}</ref> However several breeder sources list the longevity at 12&ndash;14 years<ref>{{cite web|url=http://www.dogbreedinfo.com/novascotiaducktolling.htm |title=Nova Scotia Duck-Tolling Retriever Information and Pictures, Little River Duck Dog |publisher=Dogbreedinfo.com |date=August 6, 2007 |accessdate=August 27, 2012}}{{unreliable source|date=August 2012}}</ref><ref>{{cite web|url=http://www.purebredpups.org/breed_info/106/nova_scotia_duck_tolling_retriever.aspx |title=Nova Scotia Duck Tolling Retriever &#124; Nova Scotia Duck Tolling Retrievers |publisher=Purebredpups.org |date= |accessdate=August 27, 2012}}{{unreliable source|date=August 2012}}</ref> with one indicating 16 years is not unexpected.<ref>{{cite web|author=Dog Breeds |url=http://www.petwave.com/Dogs/Dog-Breed-Center/Sporting-Group/Nova-Scotia-Duck-Tolling-Retriever/Overview.aspx |title=Nova Scotia Duck Tolling Retriever &#124; History and Health |publisher=Petwave.com |date= |accessdate=August 27, 2012}}{{unreliable source|date=August 2012}}</ref>
A survey conducted in 2002 by the Canadian breed club, involving owners of 1180 dogs worldwide, showed 73% reported in excellent health and a total of 7.5% reporting poor or bad health. 141 dogs (12%) were reported as deceased with the average age at death being 6.4 years. About 1 in 5 live to 12 years and above with the oldest living to 16 years.<ref>{{cite web|title=2002 Nova Scotia Duck Tolling Retriever Health Survey|url=http://www.toller.ca/tollerhealth/SurveySummary.html|publisher=Toller Health Coalition/NSDTR Club of Canada|accessdate=June 28, 2012}}{{unreliable source|date=August 2012|reason=This is a self-reported primary source that specializes in unusual early mortality.}}</ref> However several breeder sources list the longevity at 12&ndash;14 years<ref>{{cite web|url=http://www.dogbreedinfo.com/novascotiaducktolling.htm |title=Nova Scotia Duck-Tolling Retriever Information and Pictures, Little River Duck Dog |publisher=Dogbreedinfo.com |date=August 6, 2007 |accessdate=August 27, 2012}}{{unreliable source|date=August 2012}}</ref><ref>{{cite web|url=http://www.purebredpups.org/breed_info/106/nova_scotia_duck_tolling_retriever.aspx |title=Nova Scotia Duck Tolling Retriever &#124; Nova Scotia Duck Tolling Retrievers |publisher=Purebredpups.org |date= |accessdate=August 27, 2012}}{{unreliable source|date=August 2012}}</ref> with one indicating 16 years is not unexpected.<ref>{{cite web|author=Dog Breeds |url=http://www.petwave.com/Dogs/Dog-Breed-Center/Sporting-Group/Nova-Scotia-Duck-Tolling-Retriever/Overview.aspx |title=Nova Scotia Duck Tolling Retriever &#124; History and Health |publisher=Petwave.com |date= |accessdate=August 27, 2012}}{{unreliable source|date=August 2012}}</ref>

===Genetic diversity===
A worldwide study of the Tollers' registration history in 17 countries shows that about 90% of the genetic diversity present in the founding population has been lost. Tollers born between 1999-2008 have an effective founder size of 9.8, realised effective [[Small population size|population size]] of 18 and an average [[Coefficient of relationship|inbreeding coefficient]] of 0.26 (more closely related than full siblings). The breed is losing heterozygosity too rapidly to maintain sufficient genetic variations although the rate of inbreeding has slowed down in the past few years, suggesting the situation may have improved. But high [[Consanguinity|kinship value]] means the breed is not able to maintain a steady level of inbreeding in the long term. The author suggests introducing other breeds as outcrosses to increase genetic diversity.<ref name="Maki (2010)">{{cite doi|10.1111/j.1439-0388.2010.00851.x}}</ref>


== Gallery ==
== Gallery ==

Revision as of 03:52, 27 August 2012

Nova Scotia Duck Tolling Retriever
Tolling Retriever
Other namesYarmouth Toller
Tolling Retriever
Little Red Duck Dog
Little River Duck Dog
Common nicknamesToller, Scotty, Novie
OriginCanada (Nova Scotia)
Traits
Height Males 48–51 cm (19–20 in)
Females 45–48 cm (18–19 in)
Weight Males 20–23 kg (44–51 lb)
Females 17–20 kg (37–44 lb)
Coat Medium-length coat with a softer, dense undercoat
Colour Varying shades of red or orange
Litter size average 6.3 pups[1]
Life span 12-14 years
Kennel club standards
Fédération Cynologique Internationale standard
Dog (domestic dog)

The Nova Scotia Duck Tolling Retriever, or Toller for short, is a medium-sized breed of gundog bred primarily for hunting. The dog originated in southwestern Nova Scotia, Canada. It is the smallest of the retrievers.[2][3]

Use in hunting

Tollers are named for their ability to entice or lure waterfowl within gunshot range, called "tolling". The hunter stays hidden in a blind and sends the dog out to romp and play near the water, usually by tossing a ball or stick to be retrieved. Appearing similar to a fox, the dog's unusual activity and white markings pique the curiosity of ducks and geese, who swim over to investigate.[3]

The Nova Scotia Duck Tolling Retriever was bred to "toll", or lure, ducks into shooting range by causing a disturbance near the shore. After the duck is shot, the dog brings it to the hunter.

When the birds are close, the hunter calls the dog back to the blind, then rises, putting the birds to flight, allowing him a shot. The Toller then retrieves any downed birds. They are particularly suited for retrieving in cold water climates because of their water-repellent double coat.[3]

History

The breed was developed in the community of Little River Harbour in Yarmouth County, Nova Scotia, around the beginning of the 19th century to toll waterfowl.[2] The breed was originally known as the Little River Duck Dog or the Yarmouth Toller.[4] Its exact origins are not known but it appears that some possibly spaniel and setter-type dogs, retriever-type dogs, and farm collie may have gone into the mix.[3] It may share origins with the smaller Kooikerhondje, which has a similar method of work.[citation needed]

The Toller was officially admitted to the Canadian Kennel Club in 1945.[5] Declared the provincial dog of Nova Scotia in 1955, the breed gained greater national notoriety in 1980, when two Nova Scotia Duck Tolling Retrievers were awarded Best in Show at championship events that included many breeds.[6] On June 11, 2001, it was approved for admission into the Miscellaneous Class of the American Kennel Club and was granted full recognition into the Sporting Group on July 1, 2003.[7]

Description

Appearance

This Toller has the rich orange coat color and "foxy" head shape that are desirable for the breed

The breed is often mistaken for small Golden Retrievers, but the Toller is more active, both physically and mentally.[8] According to the breed standards, the Toller should be athletic, well-muscled, compact, medium boned, balanced and powerful. The chest is deep. Conformation judges require Tollers to be capable of tolling, and physical faults that inhibit working ability are heavily penalized. They should be of moderate build—a lack of substance or a heavy build are penalized by judges, as both detract from the type and athleticism. The legs are sturdy and solid. Tollers have webbed feet.[2][3]

Those who breed Tollers for conformation shows consider the head (clean cut, slightly wedge-shaped) to be an important feature, and believe it should resemble that of a fox and must never be blocky like that of a Golden Retriever. The ears are triangular and set high and well back from the skull.[2][3] The tail is well feathered and held jauntily when the dog is excited or moving.[2][3]

Color is any shade of red, ranging from a golden red through dark coppery red, with lighter featherings on the underside of the tail, pantaloons, and body. Even the lighter shades of golden red are deeply pigmented and rich in color. The Toller should not be buff or brown.[2][3] Although very rare, there are chocolate/liver brown Duck Tollers.[citation needed]

The Toller has usually at least one of the following white markings: tip of tail, feet (not extending above the pasterns), chest, and blaze. Lack of white is not a fault. Dogs with white on the shoulders, around ears, back of neck, or across back or flanks, or with silvery, grey or black areas in coat are disqualified from conformation shows.[2][3]

The Toller was bred to retrieve from icy waters and must have a water-repellent double coat of medium length and softness, and a soft dense undercoat. The coat may have a slight wave on the back, but is otherwise straight. Some winter coats may form a long loose curl at the throat. Featherings are soft and moderate in length. The hair on the muzzle is short and fine. Seasonal shedding is to be expected.[2][3]

Size and proportions

Tollers are the smallest of all the retriever breeds.[2][3][5] They range in height from 17–21 inches (43–53 cm) at the withers, and weigh 40–55 pounds (18–25 kg), with females being slightly shorter and lighter.[8] Tollers are always a medium-sized breed, never large; however, there has been a trend towards larger dogs in recent years.[2][3]

Tollers should be slightly longer than tall (a ratio of approximately 10 to 9). However, they should not appear long-backed.

Temperament

Nova Scotia Duck Tolling Retrievers are known to be very intelligent, alert, high-energy dogs.[9] They tend to be very affectionate and outgoing animals with family members and are known for being very patient with children. Some dogs may be reserved in new situations but they are not shy.[citation needed] They excel at many types of competitions, such as agility and obedience.

Duck Tollers are working animals and are happiest when they have a job to do. Physical stimulation should be provided for these dogs each day since they may become destructive when they are not exercised enough or left alone for too long. The breed standard states that the dog should have a strong retrieving drive, intense birdiness, endurance and a love for water. [3]

A Toller retrieving

Health

Tollers are generally hardy.[citation needed] However, like almost all dog breeds, certain genetic disorders are known to occur in the breed. This is sometimes blamed on a relatively small gene pool. The Finnish breed club states the largest health problems in the breed to be immunity related.[10] They can be affected by eye problems and hip dysplasia and are predisposed to immune-mediated rheumatic disease and steroid-responsive meningitis–arteritis.[10][11]

Progressive retinal atrophy (PRA) affects about 7% of Tollers with an estimated 40% being carriers.[12] The type of PRA associated with the breed is known as progressive rod-cone degeneration. The disease causes cells in the retina to degenerate and die, causing night blindness at first and complete blindness eventually.[13] Collie eye anomaly is estimated to have a carrier rate of 5% and an affected rate of 0.5%. It generally only cause mildly impared vision but in more severe cases can lead to retinal hemorrhaging and detachments resulting in blindness.[14]

Thyroid problems have been identified by American breeders as a priority issue, together with epilepsy and hip dysplasia. As many as 1 in 6 Tollers may have autoimmune thyroiditis. Symptoms of thyroid problems includes weight gain, skin and hair problems including hair loss, weakness, cold intolerance or infertility.[15]

Addison’s disease affected 1% of Tollers in a health survey, an incidence rate 10 times more than the general dog population. Carrier rate is estimated at 18%. This disease is also considered an important issue in the breed. Signs can include lethargy, decreased appetite, vomiting, weakness, diarrhea, increased drinking and urinations, and shivering.[16]

Health tests are available for both eye diseases and autoimmune thyroiditis. A test for Addison's disease is available but it is only for one form of the disease and there are other forms which also affects the breed.[17]

A survey conducted in 2002 by the Canadian breed club, involving owners of 1180 dogs worldwide, showed 73% reported in excellent health and a total of 7.5% reporting poor or bad health. 141 dogs (12%) were reported as deceased with the average age at death being 6.4 years. About 1 in 5 live to 12 years and above with the oldest living to 16 years.[18] However several breeder sources list the longevity at 12–14 years[19][20] with one indicating 16 years is not unexpected.[21]

Genetic diversity

A worldwide study of the Tollers' registration history in 17 countries shows that about 90% of the genetic diversity present in the founding population has been lost. Tollers born between 1999-2008 have an effective founder size of 9.8, realised effective population size of 18 and an average inbreeding coefficient of 0.26 (more closely related than full siblings). The breed is losing heterozygosity too rapidly to maintain sufficient genetic variations although the rate of inbreeding has slowed down in the past few years, suggesting the situation may have improved. But high kinship value means the breed is not able to maintain a steady level of inbreeding in the long term. The author suggests introducing other breeds as outcrosses to increase genetic diversity.[10]

Gallery

References

  1. ^ Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1016.2Fj.theriogenology.2011.12.023, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi=10.1016.2Fj.theriogenology.2011.12.023 instead.[need quotation to verify]
  2. ^ a b c d e f g h i j Canadian Kennel Club. "CKC Breeding Standards: Nova Scotia Duck Tolling Retriever". Retrieved September 7, 2010.
  3. ^ a b c d e f g h i j k l m American Kennel Club. "Nova Scotia Duck Tolling Retriever". Retrieved September 7, 2010.
  4. ^ "American Kennel Club - Nova Scotia Duck Tolling Retriever". Akc.org. Retrieved April 6, 2012.
  5. ^ a b Government of Nova Scotia. "Symbols: Nova Scotia Duck Tolling Retriever". Retrieved September 7, 2010.
  6. ^ "Nova Scotia Legislature: Duck Toller". Nslegislature.ca. March 29, 2012. Retrieved April 6, 2012.
  7. ^ Perrin, Terri. "The Nova Scotia Duck Tolling Retriever: A true Canadian canine (eh?)". Moderndogmagazine.com. Retrieved April 6, 2012.
  8. ^ a b Palika, Liz (2007). The Howell Book of Dogs. John Wiley & Sons. p. 307. ISBN 978-0-470-00921-5.
  9. ^ "Nova Scotia Duck Tolling Retriever : Dog Breed Selector: Animal Planet". Animal Planet. Retrieved November 3, 2011.
  10. ^ a b c Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1111/j.1439-0388.2010.00851.x, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi=10.1111/j.1439-0388.2010.00851.x instead.
  11. ^ Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1007/s00251-009-0387-6, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi=10.1007/s00251-009-0387-6 instead.
  12. ^ "prcd-PRA Test For: Nova Scotia Duck Tolling Retrievers". OptiGen. Retrieved August 27, 2012.
  13. ^ "The OptiGen prcd-PRA Test". OptiGen. Retrieved August 27, 2012.
  14. ^ [www.nsdtrc-usa.org/programs/health_program/cea_info.html "Questions and Answers about Collie Eye Anomaly in the Nova Scotia Duck Tolling Retriever"]. Club Logo Nova Scotia Duck Tolling Retriever Club (USA). Retrieved August 27, 2012. {{cite web}}: Check |url= value (help)
  15. ^ Folkman, Jane. "Thyroid/Addison's Study In Tollers – Michigan State University" (PDF). Nova Scotia Duck Tolling Retriever Club (USA). Retrieved August 27, 2012.
  16. ^ "Update – UC Davis Addison's Study In Tollers" (PDF). Nova Scotia Duck Tolling Retriever Club (USA). Retrieved August 27, 2012.
  17. ^ "Explanation of JADD Testing Results". Orthopedic Foundation for Animals. Retrieved August 27, 2012.
  18. ^ "2002 Nova Scotia Duck Tolling Retriever Health Survey". Toller Health Coalition/NSDTR Club of Canada. Retrieved June 28, 2012.[unreliable source?]
  19. ^ "Nova Scotia Duck-Tolling Retriever Information and Pictures, Little River Duck Dog". Dogbreedinfo.com. August 6, 2007. Retrieved August 27, 2012.[unreliable source?]
  20. ^ "Nova Scotia Duck Tolling Retriever | Nova Scotia Duck Tolling Retrievers". Purebredpups.org. Retrieved August 27, 2012.[unreliable source?]
  21. ^ Dog Breeds. "Nova Scotia Duck Tolling Retriever | History and Health". Petwave.com. Retrieved August 27, 2012.[unreliable source?]