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The dog is discriminating so that it does not annoy or even attack the house resident people.
The use of dogs as guardians is well known since ancient times. The Romans used to put mosaics (Cave canem mosaics) at the entrance of the houses to warn visitors and intruders of the presence of dangerous dogs at the property.
One of the first dog types used as guardians were the primitive mastiff-type landraces of the group known as Livestock guardian dogs with the function of protecting livestock against large predators such as wolves, bears and leopards. Orthrus is a famous example of a livestock guardian dog from the Greek mythology knowned for guarding Geryon's red cattle.
Many landlords will not allow intimidating looking guard dog breeds and big game hunting breeds to live on their properties.
Both guard dogs and watchdogs bark loudly to alert their owners of an intruder's presence and to scare away the intruder. The watchdog's function ends here; a guard dog is then capable of attacking and/or restraining the intruder.
Livestock guardian dogs are often large enough (100-200 lbs.) and strong enough to attack and drive away livestock predators. Some smaller breeds (such as Keeshonds and Tibetan Terriers) are excellent watchdogs, but not guard dogs, because they bark loudly to alert their masters of intruders, but are physically small and not given to assertive behavior. Guard dogs will bark to alert their master and to warn off an approaching animal or human threat prior to their interception of the trespasser. They are different from the smaller watchdogs in that they do not continue barking; they take action.
The following breeds are the best at watchdog barking:
- Doberman Pinscher
- German Shepherd Dog
- German Spitz (including Keeshond)
- Miniature Schnauzer
- Scottish Terrier
- West Highland White Terrier
If the risk is from human intruders, a suitable dog can be simply trained to be aggressive towards unrecognized humans and then tethered or enclosed unsupervised in an area that the owner wishes to protect when he is not around (such as at night); the stereotypical "junkyard dog" is a common example of this. If the purpose of the dog is to protect against human intruders after nightfall, a large, dark-colored dog in a dark house (lights off) would give the dog an advantage over the burglar.
It is claimed that female dogs tend to make better personal guardians than males, due to maternal instincts, but males are considered better for guarding property because of their greater territorial instinct. That may be true in general, but all dogs are individuals. Guarding against wolves, large male dogs would, in general, do better against large male wolves.
Despite the natural tendency for the guard function the training is essential to any dog.
Many currently prominent guard dogs started as general purpose farm dogs, but gradually developed into guard breeds. Some dog breeds such as the Dobermann and the Brazilian Dogo were carefully developed from the beginning for guard duty.
Many guard dog breeds have a greater amount of molossoid or mastiff DNA. This is confirmed by a DNA study done on over 270 purebred dogs. It suggests that 13 ancient breeds broke off early on, after which a group of mastiff-type dogs were developed. Despite this, the guard dogs are not restricted to mastiffs. Other dogs, like some shepherd dogs, spitz dogs, cattle dogs and some catch dogs are also great guard dogs as well as being useful as multifunctional dogs, acting as attack dogs, personal protection dogs, police dogs, sport dogs such as schutzhund dogs, etc.
Guard dog breeds tend to be territorial, averse to strangers, dominant, and protective and loyal with family. The Fila brasileiro for example has a reputation for being very intolerant of strangers and guests to the home and property. Other fierce guard dogs include breeds and landraces of the Ovtcharka type and other farm guard dogs such as the Boerboel.
Some breeds who make excellent guards are more commonly having breed specific legislation passed against them, banning them from some communities and whole countries.
List of breeds commonly used as guard dogs
- Airedale Terrier (England)
- Akita (Japan)
- [Marko – Belgian Malinois] (US)
- American Bulldog (US)
- American Staffordshire Terrier (US)
- Anatolian Shepherd (Turkey)
- Beauceron (France)
- Belgian Shepherd Dog (Malinois)
- Bernese Mountain Dog (Switzerland)
- Black Russian Terrier (Russia)
- Boerboel (South Africa)
- Bouvier des Flandres (Belgium)
- Boxer (Germany)
- Bullmastiff (England)
- Bull Terrier (England)
- Cane Corso (Italy)
- Caucasian Shepherd Dog (Georgia)
- Chow Chow (China)
- Combai (India)
- Doberman Pinscher (Germany)
- Dogo Argentino (Argentina)
- Dogue de Bordeaux (France)
- Dutch Shepherd (Netherlands)
- English Mastiff (England)
- Fila Brasileiro (Brazil)
- German Shepherd Dog (Germany)
- Giant Schnauzer (Germany)
- Hovawart (Germany)
- Kangal dog (Turkey)
- Komondor (Hungary)
- Kaikadi (dog) (India)
- Koyun dog (Turkey)
- Kumaon Mastiff (rare, nearly extinct, subject to breed-specific legislation)
- Kurdish dog (Iraqi Kurdistan)
- Kuvasz (Hungary)
- Leonberger (Germany)
- Neapolitan Mastiff (Italy)
- Maremma Sheepdog (Italy)
- Perro de Presa Canario (Spain)
- Rajapalayam (Bharata varsha)
- Rhodesian Ridgeback (Africa)
- Šarplaninac (Albania/North Macedonia/Kosovo/Serbia)
- Schipperke (Flanders-Belgium)
- Shar-Pei (China)
- Spanish Mastiff (Spain)
- Standard Schnauzer (Germany)
- Tibetan Mastiff (China)
- Tornjak (Bosnia-Herzegovina/Croatia)
- Tosa (Japan)
List of other guard dog breeds
Note: some of these breeds are not AKC or UKC recognized and a few are not FCI recognized, but all at least have their own breed club.
- Aidi (Africa)
- Airedale Terrier (UK)
- Alano Español (Spain)
- American Eskimo Dog (Germany)
- Appenzell Mountain Dog (Switzerland)
- Australian Cattle Dog (Australia)
- Australian Kelpie (Australia)
- Australian Shepherd (US)
- Bandog (US)
- Bergamasco Shepherd (Italy)
- Briard (France)
- Broholmer (Denmark)
- Bucovina Shepherd Dog (Romania)
- Cão de Castro Laboreiro (Portugal)
- Carpathian Shepherd Dog (Romania)
- Dogo Guatemalteco (Guatemala)
- German Shorthaired Pointer (Germany)
- German Wirehaired Pointer (Germany)
- Great Dane (Germany)
- Great Pyrenees (France)
- Greater Swiss Mountain Dog (Switzerland)
- Hovawart (Germany)
- Icelandic Sheepdog (Iceland)
- Karelian Bear Dog (Finland)
- Kerry Blue Terrier (Ireland)
- Komondor (Hungary)
- Moscow Watchdog (Russia)
- Perro de Presa Mallorquin
- Romanian Mioritic Shepherd Dog (Romania)
- Saint Bernard (Switzerland)
- Schipperke (Belgium)
- Shiloh Shepherd (US)
- Smooth Collie (Scotland)
- Weimaraner (Germany)
The laws regarding ownership and usage of guard dogs vary from country to country.In England the main legislation relating to the use of guard dogs on commercial premises are contained within the 1975 Guard Dogs Act, The act specifies the requirements of kennels and the need to display Guard Dog Warning Signs at the entrance to sites.
- Attack dog
- Beware of the dog
- Dogs in warfare
- Faithful Ruslan
- Livestock guardian dog
- Service Dogs Of America
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