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Owning A Dog vs. High Content Wolfdog
Owning A Dog vs. High Content Wolfdog
::2013/07/25::
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My sweet wolfdog Katey. These are her wolf genes showing
My sweet wolfdog Katey. These are her wolf genes showing
::2011/12/27::
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DOG WHISPERER Cesar Millan on WOLF-DOG Hybrids (Oct. 2010)
DOG WHISPERER Cesar Millan on WOLF-DOG Hybrids (Oct. 2010)
::2010/11/13::
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Howling Wolfdog
Howling Wolfdog
::2013/11/09::
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Wolf dog and boars
Wolf dog and boars
::2014/04/20::
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Loki and Max   ( High content wolfdog wolf dog hybrid )
Loki and Max ( High content wolfdog wolf dog hybrid )
::2009/09/13::
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Jerry and his Wolf Dog Blue
Jerry and his Wolf Dog Blue
::2011/10/04::
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Wolfdog Training with Journey
Wolfdog Training with Journey
::2013/03/31::
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Husky vs. Wolf Hybrid
Husky vs. Wolf Hybrid
::2012/11/26::
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Wolf dog sings to a baby to stop his cry
Wolf dog sings to a baby to stop his cry
::2009/05/01::
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Teaching a 2 Month Old Wolfdog Puppy to Sit
Teaching a 2 Month Old Wolfdog Puppy to Sit
::2013/03/25::
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Czechoslovakian Wolf Dog Lovec - The First Two Weeks
Czechoslovakian Wolf Dog Lovec - The First Two Weeks
::2014/05/21::
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Czechoslovakian Wolfdog vs. Malamute
Czechoslovakian Wolfdog vs. Malamute
::2010/11/07::
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Old Spice | Wolfdog Akadémia - mit együnk, és miért húst?
Old Spice | Wolfdog Akadémia - mit együnk, és miért húst?
::2013/12/12::
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Wolf Dog hybrid
Wolf Dog hybrid
::2009/05/17::
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Cesar Millan / Jennifer McCarthy, Wolf-Dog Hybrids Special 1
Cesar Millan / Jennifer McCarthy, Wolf-Dog Hybrids Special 1
::2013/06/12::
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Old Spice | Wolfdog Akadémia - hogyan legyünk férfiak?
Old Spice | Wolfdog Akadémia - hogyan legyünk férfiak?
::2013/12/06::
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Introducing Luna the Wolfdog to Skitz the Cat
Introducing Luna the Wolfdog to Skitz the Cat
::2013/04/07::
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Wolfdog Howling at the Neighbors
Wolfdog Howling at the Neighbors
::2014/05/27::
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Diary of a Czechoslovakian Wolfdog, Ottokar
Diary of a Czechoslovakian Wolfdog, Ottokar
::2011/11/24::
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S07E04 Wolf Dogs   Out of the Wild
S07E04 Wolf Dogs Out of the Wild
::2014/03/08::
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Before You Buy A Wolf-dog Puppy
Before You Buy A Wolf-dog Puppy
::2013/02/14::
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The Wolf-Dog Mirror Experiment
The Wolf-Dog Mirror Experiment
::2013/07/05::
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IFAW Alaska Wolf-Dog Rescue
IFAW Alaska Wolf-Dog Rescue
::2012/03/20::
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Wolfdog Training--Shiloh and Oka
Wolfdog Training--Shiloh and Oka
::2013/03/23::
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Old Spice | Akademia Wolfdoga - Wolfdog przybywa!
Old Spice | Akademia Wolfdoga - Wolfdog przybywa!
::2013/12/05::
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Yamnuska Wolf Dog Sanctuary Canmore Alberta Canada
Yamnuska Wolf Dog Sanctuary Canmore Alberta Canada
::2014/02/20::
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The Czechoslovakian Wolfdog
The Czechoslovakian Wolfdog
::2010/04/17::
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Wolfdog puppy 1st snow 12 weeks old.
Wolfdog puppy 1st snow 12 weeks old.
::2012/02/09::
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Luna the wolfdog is happy we
Luna the wolfdog is happy we're home
::2014/04/05::
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my wolf dog playing with water balloons
my wolf dog playing with water balloons
::2012/09/02::
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Wolfdog walking in the Mall
Wolfdog walking in the Mall
::2007/10/07::
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I Am A Wolf Dog
I Am A Wolf Dog
::2013/07/12::
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Wolfdog with 5 week old kittens
Wolfdog with 5 week old kittens
::2011/12/21::
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Wolfdog hunting a Squirrel
Wolfdog hunting a Squirrel
::2014/07/05::
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CS Wolfdog Howling
CS Wolfdog Howling
::2011/05/05::
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LPS Kyle the wolfdog (part 1) "Kyle or Keeniy?"
LPS Kyle the wolfdog (part 1) "Kyle or Keeniy?"
::2011/01/29::
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Czechoslovakian wolf dog
Czechoslovakian wolf dog
::2013/03/23::
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Luna the wolfdog and her funny puppy wolf howl
Luna the wolfdog and her funny puppy wolf howl
::2013/04/07::
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How to Operate Computers Old Spice   Wolfdog
How to Operate Computers Old Spice Wolfdog's YouTube
::2013/08/06::
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Skijouring and visiting the Wolfdog Sanctuary in Canmore Alberta Canada with the Planet D
Skijouring and visiting the Wolfdog Sanctuary in Canmore Alberta Canada with the Planet D
::2014/01/16::
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"WOLF DOG" Jim Davis, Allison Hayes, Tony Brown. 7-16-1958.
"WOLF DOG" Jim Davis, Allison Hayes, Tony Brown. 7-16-1958.
::2014/07/08::
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czechoslovakian wolfdog & amstaff
czechoslovakian wolfdog & amstaff
::2012/03/24::
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Wolfdog is new marketing director. Old Spice Ad.
Wolfdog is new marketing director. Old Spice Ad.
::2013/04/13::
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Saarloos Wolfdog Puppy 9 weeks..
Saarloos Wolfdog Puppy 9 weeks..
::2009/04/06::
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Wolf Dog (The Movie Made In Markdale - 1958)
Wolf Dog (The Movie Made In Markdale - 1958)
::2013/01/26::
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Jed The Wolf Dog
Jed The Wolf Dog
::2013/03/29::
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Silly Wolfdog Sounds
Silly Wolfdog Sounds
::2014/10/09::
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Wolf dogs taking treats ( High content wolfdog wolf dog hybrid )
Wolf dogs taking treats ( High content wolfdog wolf dog hybrid )
::2010/02/16::
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Old Spice Wolfdog Academy -- 7 -- Диета
Old Spice Wolfdog Academy -- 7 -- Диета
::2014/02/17::
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From Wikipedia, the free encyclopedia
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Not to be confused with Wolfhound (disambiguation).
Wolfdog
Llop.jpg
An Arctic wolf/Alaskan malamute hybrid from Lobo Park, Antequera
Other names Wolf–dog hybrid
Wolf hybrid
Traits
Dog (Canis lupus familiaris)

A wolfdog (also called a wolf–dog hybrid or wolf hybrid) is a canid hybrid resulting from the hybridization of a domestic dog (Canis lupus familiaris) to one of four other Canis species, the gray (Canis lupus), eastern timber (Canis lycaon), red (Canis rufus), and Ethiopian wolves (Canis simensis). Intra-hybridizations between dogs and other subspecies of gray wolves are the most common wolfdogs since dogs and gray wolves are considered the same species hence are genetically very close and have shared vast portions of their ranges for millennia. Such hybridizations in the wild have been detected in many populations scattered throughout Europe and North America, usually occurring in areas where wolf populations have declined from human impacts and persecutions.[1][2] At the same time, hybrids are also often bred in captivity for various purposes. Inter-hybridizations of dogs and two other North American wolf species have also occurred historically in the wild, although it is often difficult for biologists to discriminate the dog genes in the eastern timber and red wolves from the gray wolf genes also present in these wolf species due to their historical overlaps with North American gray wolves as well as with coyotes, both of which have introgressed into the eastern timber and red wolf genepools.[3] At the same time, because many isolated populations of the three wolf species in North America have also mixed with coyotes in the wild,[4] it has been speculated by some biologists that some of the coywolf hybrids in the northeastern third of the continent may also have both coydogs and wolfdogs in their genepool.[5] Hybrids between dogs and Ethiopian wolves discovered in the Ethiopian Highlands likely originated from past interactions between free-roaming feral dogs and Ethiopian wolves living in isolated areas.[6]

The term "wolfdog" is preferred by most of the animals' proponents and breeders because the domestic dog was taxonomically recategorized in 1993 as a subspecies of Canis lupus. The American Veterinary Medical Association and the United States Department of Agriculture refer to the animals as wolf–dog hybrids.[7] Rescue organizations consider any dog with wolf heritage within the last five generations to be a wolfdog, including some established wolfdog breeds.[8][unreliable source?]

Varieties

One of the issues that many researchers and wolfdog communities are faced with is identifying wolfdogs from pure dogs and any of the wolf species mixed into the hybrid. The most common method used by various wolfdog communities is phenotyping, a method that involves observing the animal's physical features.[9] This method is often favoured for many in determining the degree of wolf and northern spitz-type dog that is in a hybrid. However, a lot of criticisms have been made by opponents within some communities who tend to point out that phenotyping cannot always determine the wolf-contents accurately. Another challenge involves determining exactly the domestic breeds and wolf subspecies involved in the admixture due to the fact that dogs are known to come in various breeds while gray wolves in turn come in various subspecies with many different regional ecotypes hence have different physical features depending on the subspecies used in the breeding. Although wolves are often mixed with spitz types such as Siberian huskies, Alaskan Malamutes, and German Shepherd dogs, hybrids between wolves to non-spitz type dogs such as poodles,[10] pitbulls,[11] and Great Pyrenees also exist, the latter hybrids often having with less lupine features.

History

Prehistoric wolfdogs

Evidence for prehistoric domesticated wolfdogs in the Americas dates back at least 10,000 years[12] while fossil evidence in Europe points to their use in hunting mammoths.[13]

Teotihuacan wolfdogs

In 2010, experts announced that they had found the remains of many wolf-dogs that had been kept by the warrior class of the Teotihuacan civilization in Mexico's central valley about two thousand years ago, and that, in light of this evidence, certain animals commonly depicted in the art of that culture and which had been thought to be strange dogs or coyotes were likely instead wolf-dogs.[14][clarification needed]

North American Gray wolf-Domestic dog Hybrids

In 1998, the USDA estimated an approximate population of 300,000 wolfdogs in the United States (the highest of any country world-wide), with some other sources giving a population possibly as high as 500,000.[7] In first-generation hybrids, gray wolves are most often crossed with wolf-like dogs (such as German Shepherds, Siberian Huskies, and Alaskan Malamutes) for an appearance most appealing to owners desiring an exotic pet.[15]

British wolfdogs

Wolfdogs, as illustrated in The Menageries: Quadrupeds Described and Drawn from Living Subjects by W. Ogilby, 1829

The first record of wolfdog breeding in Great Britain comes from the year 1766 when what is thought was a male wolf mated with a dog identified in the language of the day as a "Pomeranian", although it may have differed from the modern Pomeranian breed. The union resulted in a litter of nine pups. Wolfdogs were occasionally purchased by English noblemen, who viewed them as a scientific curiosity. Wolfdogs were popular exhibits in British menageries and zoos.[15]

Documented breeding

Today, at least seven breeds of dog exist that acknowledge a significant amount of recent wolf-dog hybridization in their creation. One breed is the Wolamute, a/k/a Malawolf, a cross between an Alaskan Malamute, considered to be quite possibly the oldest domesticated breed in the world,[citation needed] and a Timber Wolf. Four breeds were the result of intentional crosses with German Shepherd Dogs (one of the original intentionally bred wolf/dog crossbreeds), and have distinguishing characteristics of appearance that may reflect the varying subspecies of wolf that contributed to their foundation stock. Other, more unusual crosses have occurred; recent experiments in Germany were conducted in the crossing of wolves and poodles.[16] The intent behind creating the breeds has ranged widely from simply the desire for a recognizable companion high-content wolfdog to professional military working dogs. Typical examples include:

German Shepherds

The breeding program that created the German Shepherd included wolfdogs

Among the dogs used in the development of the German Shepherd, at least four were either wolfdogs or partly descended from wolfdogs. In 1899, Max von Stephanitz, an ex-cavalry captain and former student of the Berlin Veterinary College, was attending a dog show when he was shown a dog named Hektor Linksrhein, who was allegedly one-quarter wolf. Renamed Horand von Grafrath, the dog and his progeny were used to create the German Shepherd. Horand became the centre-point of the breeding programs and was bred with dogs belonging to other society members that displayed desirable traits. Although fathering many pups, Horand's most successful was Hektor von Schwaben.[17] Hektor was line bred with another of Horand's offspring and produced Beowulf, who later fathered a total of eighty-four pups, mostly through being line bred with Hektor's other offspring. In the original German Shepherd studbook, Zuchtbuch für Deutsche Schäferhunde (SZ), within the two pages of entries from SZ #41 to SZ #76, there are four wolf crosses.[18] This is the first documented use of pure wolf genes to create a domestic dog breed, the German Shepherd, which is historically thought to be the first documented intentionally-bred wolfdog.

The Saarloos Wolfdog

A Saarloos Wolfdog

The Saarloos wolfdog traces its origins to the efforts of a Dutch breeder in 1935.[19] Leendert Saarloos started crossbreeding a German Shepherd male to a female Mackenzie Valley Wolf (Canis lupus occidentalis). He aimed for an improved version of the German Shepherd that would be immune to canine distemper. He succeeded insofar as the Saarloos wolfdog known today is a strong, imposing breed that has kept its wolf-like characteristics; it is cautious, reserved, and lacks the ferocity to attack. It is not, however, the dog that Leendert Saarloos hoped to get, as nearly all the first-generation hybrids succumbed to distemper. Until Leendert Saarloos died in 1969, he was in full control over the breeding of his "European Wolfdog". The Dutch Kennel Club recognized the breed in 1975. To honor its creator they changed the name to "Saarloos Wolfdog". In 1981 the breed was recognized by the Fédération Cynologique Internationale (FCI). Some Saarloos Wolfdogs have been trained as guide dogs for the blind and as rescue dogs.

The Czechoslovakian Wolfdog

A Czechoslovakian Wolfdog

In the 1950s, the Czechoslovakian Wolfdog was also created to work on border patrol in the countries now known as Slovakia and the Czech Republic. It is recognized by the Foundation Stock Service of the American Kennel Club, the United Kennel Club, and the Fédération Cynologique Internationale, and today is used in agility, obedience, search and rescue, police work, therapy work, and herding in Europe and the United States.

The Lupo Italiano

A Lupo Italiano

The Lupo Italiano was created in 1966 by crossing a wild wolf from Northern Lazio with a German Shepherd.[20] Its maternal genetics and gestation was from the wild wolf.[21]

The Kunming Wolfdog

A Kunming Dog

The Kunming Wolfdog (Chinese: 昆明狼狗; pinyin: Kūnmíng lánggǒu), also commonly known as the Kunming Dog (Chinese: 昆明犬; pinyin: Kūnmíng quǎn)[22] is an established breed of wolfdog originated in China.[23] Unlike most other wolfdog crosses, Kunming dogs are suitable as guard dogs and working dogs due to their German Shepherd dog ancestry. They have been trained as military assistant dogs to perform a variety of tasks such as detecting mines. Some are also trained to be fire dogs and rescue dogs.[24] Today they are commonly kept as family companions by many pet owners in China.

New World Black Wolves

Genetic research has shown that wolves with black pelts owe their coloration to a mutation that first arose in domestic dogs

Genetic research from the Stanford University School of Medicine and the University of California, Los Angeles revealed that wolves with black pelts owe their distinctive coloration to a mutation that entered the wolf population through wolf-dog hybridisation.[25] Adolph Murie was among the first wolf biologists to speculate that the wide color variation in wolves was due to interbreeding with dogs;[26]

"I suppose that some of the variability exhibited in these wolves could have resulted from crossings in the wild with dogs. Such crosses in the wild have been reported and the wolf in captivity crosses readily with dogs. Some years ago at Circle, Alaska, a wolf hung around the settlement for some time and some of the dogs were seen with it. The people thought that the wolf was a female attracted to the dogs during the breeding period. However, considerable variability is probably inherent in the species, enough perhaps to account for the variations noted in the park and in skins examined. The amount of crossing with dogs has probably not been sufficient to alter much the genetic composition of the wolf population."

The Wolves of Mount McKinley by Adolph Murie, 1944, ISBN 0-295-96203-8, 978-0-295-96203-0, 238 pages

In 2008, Dr. Gregory S. Barsh, a professor of genetics and pediatrics at the Stanford University School of Medicine used molecular genetic techniques to analyze DNA sequences from 150 wolves, half of them black, in Yellowstone National Park, which covers parts of Wyoming, Montana and Idaho. It was discovered that a gene mutation responsible for the protein beta-defensin 3, known as the K locus, is responsible for the black coat color in dogs.[27] After finding that the same mutation was responsible for black wolves in North America and the Italian Apennines, he set out to discover the origin of the mutation. Dr. Barsh and his colleagues concluded that the mutation arose in dogs 13,000 to 120,000 years ago, with a preferred date of 47,000 years ago after comparing large sections of wolf, dog, and coyote genomes.[25] At the University of California, Los Angeles, Robert K. Wayne, a canine evolutionary biologist, stated that he believed that dogs were the first to have the mutation. He further stated that even if it originally arose in Eurasian wolves, it was passed on to dogs who, soon after their arrival, brought it to the New World and then passed it to wolves and coyotes.[28] Black wolves with recent dog ancestry tend to retain black pigment longer as they age.[29]

Random-bred wolfdogs

Cases of accidental breeding of wolfdogs are known (though this is very rare), where a domestic dog female on oestrus strays and is mated by a male wild wolf.

Breed-specific legislation

The wolfdog hybrid has been the center of controversy for much of its history, and most breed-specific legislation is either the result of the animal's perceived danger or its categorization as protected native wildlife.[30] The Humane Society of the United States, the RSPCA, Ottawa Humane Society, the Dogs Trust and the Wolf Specialist Group of the IUCN Species Survival Commission consider wolfdogs to be wild animals and therefore unsuitable as pets, and support an international ban on the private possession, breeding, and sale of wolfdogs.[15][31][32]

According to the National Wolfdog Alliance, 40 U.S. states effectively forbid the ownership, breeding, and importation of wolfdogs, while others impose some form of regulation upon ownership.[33] In Canada, the provinces of Alberta, Manitoba, Newfoundland, and Prince Edward Island prohibit wolfdogs as pets.[34] Most European nations either outlaw the animal entirely or put restrictions on ownership.[35] Wolfdogs were among the breeds banned from the U.S. Marine Corps base at Camp Pendleton and elsewhere after a fatal dog attack by a pit bull on a child.[36]

Wolfdogs in the wild

Hybridization in the wild usually occurs near human habitations where wolf density is low and dogs are common.[37] However, there were several reported cases of wolfdogs in areas with normal wolf densities in the former Soviet Union.[38] Wild wolfdogs were occasionally hunted by European aristocracy, and were termed lycisca to distinguish them from common wolves.[39] Noted historic cases (such as the Beast of Gévaudan) of large wolves that were abnormally aggressive toward humans, may be attributable to wolf-dog mating.[7] In Europe, unintentional matings of dogs and wild wolves have been confirmed in some populations through genetic testing. As the survival of some Continental European wolf packs is severely threatened, scientists fear that the creation of wolfdog populations in the wild is a threat to the continued existence of European wolf populations.[40] However, extensive wolf–dog hybridization is not supported by morphological evidence, and analyses of mtDNA sequences have revealed that such matings are rare.[37] In 1997, during the Mexican Wolf Arizona Reintroduction, controversy arose when a captive pack at Carlsbad designated for release was found to be largely composed of wolfdogs by Roy McBride, who had captured many wolves for the recovery programme in the 1970s. Though staff initially argued that the animals' odd appearance was due to captivity and diet, it was later decided to euthanise them.[41]

Description

Skeleton of a wolf-dog hybrid from the Muséum national d'histoire naturelle

The physical characteristics of an animal created by breeding a wolf to a dog are not predictable, similar to that of mixed-breed dogs. Genetic research shows that wolf and dog populations initially diverged approximately 14,000 years ago and have interbred only occasionally since, accounting for the dissimilarity between dogs and wolves in behavior and appearance.[42] In many cases the resulting adult wolfdog may be larger than either of its parents due to the genetic phenomenon of heterosis (commonly known as hybrid vigor).[7] Breeding experiments in Germany with poodles and wolves, and later on with the resulting wolfdogs showed unrestricted fertility, mating via free choice and no significant problems of communication (even after a few generations). The offspring of poodles with either coyotes and jackals however all showed a decrease in fertility, significant communication problems, and an increase of genetic diseases after three generations of interbreeding between the hybrids. The researchers therefore concluded that domestic dogs and wolves are the same species.[16]

Hybrids display a wide variety of appearances, ranging from a resemblance to dogs without wolf blood to animals that are often mistaken for full-blooded wolves. A lengthy study by DEFRA and the RSPCA found several examples of misrepresentation by breeders and indeterminate levels of actual wolf pedigree in many animals sold as wolfdogs. The report noted that uneducated citizens misidentify dogs with wolf-like appearance as wolfdogs.[15] Wolfdogs tend to have somewhat smaller heads than pure wolves, with larger, pointier ears that lack the dense fur commonly seen in those of wolves. Fur markings also tend to be very distinctive and not well blended. Black coloured hybrids tend to retain black pigment longer as they age, compared to black wolves.[29] In some cases, the presence of dewclaws on the hind feet is considered a useful, but not absolute indicator of dog gene contamination in wild wolves. Dewclaws are the vestigial first toes, which are common on the hind legs of domestic dogs but thought absent from pure wolves, which only have four hind toes.[40] Observations on wild wolf hybrids in the former Soviet Union indicate that wolf hybrids in a wild state may form larger packs than pure wolves, and have greater endurance when chasing prey.[43] High wolf-content hybrids typically have longer canine teeth than dogs of comparable size, with some officers in the South African Defence Force commenting that the animals are capable of biting through the toughest padding "like a knife through butter".[44] Their sense of smell apparently rivals that of most established scenthounds. Tests undertaken in the Perm Institute of Interior Forces in Russia demonstrated that high wolf-content hybrids took 15–20 seconds to track down a target in training sessions, whereas ordinary police dogs took 3–4 minutes.[45]

Health

Wolf-dog hybrids are generally said to be naturally healthy animals, and are affected by fewer inherited diseases than most breeds of dog. Wolfdogs are usually healthier than either parent due to heterosis.[7] Some of the established breeds of wolfdog that exist today were bred specifically to improve the health and vigor of working dogs.

There is some controversy over the effectiveness of the standard dog/cat rabies vaccine on a wolfdog. The USDA has not to date approved any rabies vaccine for use in wolf-dog hybrids, though they do recommend an off-label use of the vaccine.[46] Wolfdog owners and breeders purport that the lack of official approval is a political move to prevent condoning wolfdog ownership.[47]

Temperament and behavior

Wolf-dog hybrids are a mixture of genetic traits, which results in less predictable behavior patterns compared to either the wolf or dog.[7] The adult behavior of hybrid pups also cannot be predicted with comparable certainty to dog pups, even in third-generation pups produced by wolfdog matings with dogs or from the behavior of the parent animals.[7] Thus, though the behavior of a single individual wolf hybrid may be predictable, the behavior of the type as a whole is not.[7] The majority of high wolf-content hybrids are very curious and are generally no more destructive than any other curious or active dogs.

Aggression

A wolf’s behavior is typically more socially shy and timid toward humans than that of a dog.[48][49][50][51] Due to the variability inherent to their hybridization,[7] whether a wolf–dog cross should be considered more dangerous than a dog depends on behavior specific to the individual alone rather than to wolfdogs as a group.

Trainability

The view that aggressive characteristics are inherently a part of wolfdog temperament has been contested in recent years by wolfdog breeders and other advocates of wolfdogs as pets.[52][53] Proponents of wolfdogs as pets say that the higher wolf-content animals are naturally timid and fearful of humans, but that with proper human association, training, and responsible ownership nearly all wolfdogs can become good companions, especially if their association and training begins at an early age. Even in cases of wolfdogs displaying consistently dog-like behavior, they may occasionally retain some wolf-like behavior such as digging dens, chewing up household items, climbing fences, and, to varying degrees, displaying some difficulty in housebreaking in relation to how high their wolf genetic content is. Low wolf-content wolfdogs rarely have these problems any more strongly or significantly than any other large-breed dog.

Further reading

  • Living with Wolfdogs by Nicole Wilde
  • Wolfdogs A-Z: Behavior, Training & More by Nicole Wilde
  • The Wolf Hybrid by Dorothy Prendergast
  • Above Reproach: A Guide for Wolf Hybrid Owners by Dorothy Prendergast
  • Between Dog and Wolf: Understanding the Connection and Confusion by Jessica Addams and Andrew Miller

See also

References

  1. ^ http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0086409
  2. ^ http://onlinelibrary.wiley.com/doi/10.1046/j.1523-1739.1999.97425.x/abstract;jsessionid=3701E88446C129A3898F1E177A56284E.f02t04
  3. ^ http://wolf.nrdpfc.ca/greatlakeswolf.htm
  4. ^ http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0003333
  5. ^ http://www.nytimes.com/2010/09/28/science/28coyotes.html?pagewanted=all&_r=0
  6. ^ http://www.ncbi.nlm.nih.gov/pubmed/7921357
  7. ^ a b c d e f g h i "The Wolf-Dog Hybrid: An Overview of a Controversial Animal". Animal Welfare Information Center Newsletter. 2000. Retrieved 2008-05-17. 
  8. ^ "Full Moon Farm Wolf and Wolfdog Rescue - What is a Wolfdog?". Fullmoonfarm.org. Retrieved 2013-12-16. 
  9. ^ http://www.texx-wolf-tails.com/contentandphenotyping.htm
  10. ^ http://dogpsychology.dog-articles.net/articles/Comparison-Study-Between-Wolves-and-Poodles.html
  11. ^ http://www.missionwolf.org/wolves/oreo/
  12. ^ Walker, D. N.; Frison, G. C. (1982). "Studies on Amerindian Dogs 3: Prehistoric Wolf/Dog Hybrids from the Northwestern Plains". Journal of Archaeological Science 9 (2): 125–172. 
  13. ^ Schwartz, M. (1997). A History of Dogs in the Early Americas. Yale U. Pr. ISBN 0-300-07519-7. 
  14. ^ "Chap 1" (PDF). Retrieved 2014-02-14. 
  15. ^ a b c d "The Keeping of Wolf-Hybrids in Great Britain" (PDF). RSPCA. Retrieved 2008-06-11. 
  16. ^ a b Doris Feddersen-Petersen, Hundepsychologie, 4. Auflage, 2004, Franck-Kosmos-Verlag 2004
  17. ^ Stevens, p.11
  18. ^ "Progency list for V Beowulf". Pedigree Database. Retrieved 2008-08-14. 
  19. ^ http://www.ukcdogs.com/Web.nsf/Breeds/Saarloosewolfdog
  20. ^ "Photos and characteristics of the "Lupo italiano"". Menandpets.com. Retrieved 2013-12-16. 
  21. ^ "Lupo italiano". Italia-online.co.uk. Retrieved 2014-03-04. 
  22. ^ "昆明犬 - 动物百科". Chinabaike.com. 2007-10-29. Retrieved 2014-03-04. 
  23. ^ "Wolfdogs - Snowdog". Snowdog-northerninuit.webs.com. Retrieved 2012-02-21. 
  24. ^ "昆明犬(图片)保留了早期工作德国牧羊犬基因但退化已令人担忧-军犬网—军犬德国牧羊犬". Armydog.com.cn. 2009-02-01. Retrieved 2014-03-04. 
  25. ^ a b "New World Wolves and Coyotes Owe Debt to Dogs". The New York Times. Retrieved 2014-03-04. 
  26. ^ "Adolph Murie speculated on dog-wolf hybridization as the source of unusual color". Retrieverman.wordpress.com. 2013-08-27. Retrieved 2013-12-16. 
  27. ^ "Black Wolf Mystery Solved". Redorbit.com. 2009-02-06. Retrieved 2013-12-16. 
  28. ^ Thomas H. Maugh II (2009-02-07). "The big black wolf is a legacy from dogs, study finds". Latimes.com. Retrieved 2013-12-16. 
  29. ^ a b "The Wolf Hybrid: Identification". Monty Sloan. Wolf Park. Archived from the original on 2007-03-03. Retrieved 2007-05-11. 
  30. ^ [1][dead link]
  31. ^ "Ottawa Humane". Ottawahumane.ca. Retrieved 2013-12-16. 
  32. ^ [2][dead link]
  33. ^ "NWA". Wolfdogalliance.org. Retrieved 2013-12-16. 
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