Wolf-dog hybrid
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Dark hyena
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{{distinguish|Wolfhound}}
{{Infobox Dogbreed
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|name= Wolf-Dog Hybrid
|image= TWH-jolly.JPG
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|image_caption= This [[Czechoslovakian Wolfdog]] shows a distinctly wolf-like appearance.
|altname= Wolfdog <br> Wolf Hybrid <br>
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A '''wolf-dog hybrid''' (also called a '''wolf hybrid''' or '''wolfdog''') is a [[canid hybrid]] resulting from the [[mating]] of a [[Gray Wolf|wolf]] (''Canis lupus'') and a [[dog]] (''Canis lupus familiaris''). The term "wolfdog" is preferred by most wolfdog proponents and breeders since the domestic dog was recently taxonomically recategorized as a [[subspecies]] of wolf. Professional organizations such as the [[American Veterinary Medical Association]] and government agencies such as the [[United States Department of Agriculture]] refer to the animals as wolf-dog hybrids.<ref name="Controversy">{{cite web|date=2000|title=The Wolf-Dog Hybrid: An Overview of a Controversial Animal|publisher= Animal Welfare Information Center Newsletter|url=http://www.nal.usda.gov/awic/newsletters/v5n4/5n4wille.htm|accessdate=2008-05-17}}</ref> Rescue organizations consider any animal with wolf heritage within the last five generations to be a wolfdog, including some established wolfdog breeds.<ref>[http://www.fullmoonfarm.org/what_is_a_wolfdog.php Full Moon Farm Wolf and Wolfdog Rescue - What is a Wolfdog?<!-- Bot generated title -->]</ref>
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.<ref name="Controversy" />
In first generation hybrids, [[Gray Wolf|gray wolves]] are most often crossed with wolf-like dogs (such as [[German Shepherd Dog]]s, [[Siberian Husky|Siberian Huskies]], and [[Alaskan Malamute]]s) for an appearance most appealing to owners desiring to own an [[exotic pet]].<ref>[http://www.defra.gov.uk/wildlife-countryside/gwd/wolfdogs/wolfdogs.pdf DEFRA]</ref> Since wolf hybrids are genetic mixtures of wolves and dogs, their physical and behaviorial characteristics cannot be predicted with any certainty.<ref name="Controversy" />
==History==
===Origins===
Evidence for prehistoric domesticated wolfdogs in the Americas dates back at least 10,000 years<ref>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.</ref> while fossil evidence in Europe points to their use in hunting mammoths.<ref> Schwartz, M. (1997). A History of Dogs in the Early Americas. Yale University Press. ISBN 0300075197.</ref> Noted historic cases (such as the [[Cevennes]], [[France]] wolf-attack incidents of 1764-1767) of large wolves that were abnormally aggressive toward humans, may be attributable to wolf-dog mating.<ref name="Controversy" /> In terms of intentional breeding efforts, the first documented wolfdog breed, the [[Saarlooswolfhond]], did not begin to be developed until the 1920's. Hybrids were used as [[attack dog]]s in [[South Africa under apartheid]].<ref name="Times" />
=== Breed-specific legislation ===
The wolfdog hybrid has been the center of much controversy for much of its history, and most [[breed-specific legislation]] is either the result of the animal's perceived danger or a categorization as protected native wildlife.<ref>[http://www.defra.gov.uk/wildlife-countryside/gwd/wolfdogs/wolfdogs.pdf DEFRA]</ref> The [[Humane Society of the United States]], the [[RSPCA]], local [[Canadian]] [[Humane society|Humane Societies]], the [[National Canine Defense League]] 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 sales of wolf-dog hybrids.<ref>[http://www.ottawahumane.ca/wolfdoghybrids.html Ottawa Humane]</ref> <ref>[http://www.hsus.org/press_and_publications/press_releases/wolf_and_wolf-dog_hybrid.html Humane Society of the U.S. Press releases]</ref> <ref>[http://www.defra.gov.uk/wildlife-countryside/gwd/wolfdogs/wolfdogs.pdf DEFRA]</ref>
[[Image:Lupo appenninico 3edit.jpg|thumb|The [[Italian wolf]] is one threatened population of wild canid that has shown instances of hybridization with domestic dogs.]]
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.<ref>[http://www.wolfdogalliance.org/legislation/statelaws.html NWA]</ref> Most European nations, as well as many U.S. states and municipalities, also either outlaw the animal entirely or put restrictions on ownership.<ref>[http://www.wolftrust.org.uk/wolfdogs.html Wolf Trust]</ref><ref>[http://www.wolfdogalliance.org/legislation/statelaws.html National Wolf Dog Alliance]</ref>.
===Wolf-dog hybrids and threatened wolf populations===
Hybridization in the wild usually occurs near human habitations where wolf density is low and dogs are common.<ref name="WOLVES">{{cite book | author= L. David Mech & Luigi Boitani | url = http://www.amazon.com/Wolves-Behavior-Conservation-David-Mech/dp/0226516962 | title=Wolves: Behaviour, Ecology and Conservation | year=2001 | pages= p 448 | id= ISBN 0226516962 }}</ref> However, there were several reported cases of wolf-dogs in areas with normal wolf densities in the former Soviet Union. <ref>Der Wolf; Prof. Dr. Dmitrij Iwanowitsch Bibikow, Moskau, 2. Auflage; A. Ziemsen Verlag, Wittenberg Lutherstadt, 1990, ISBN 3-7403-0155-4</ref> In Europe, unintentional matings of dogs and wild wolves has been confirmed in some populations through genetic testing. As the survival of most Continental wolf packs is severely threatened, scientists fear that the creation of wolf-dog hybrid populations in the wild is a threat to the continued existence of European wolf populations.<ref name="AP">{{cite web | url = http://news.bbc.co.uk/1/hi/sci/tech/3602741.stm | title = "Claws reveal wolf survival threat" | work = Paul Rincon | publisher = BBC online | accessdate = 2007-05-11}}</ref> However, extensive wolf-dog hybridization is not supported by morphological evidence, and analyses of [[mtDNA]] sequences have revealed that such matings are rare.<ref name="WOLVES" /> However, since mtDNA is mainly maternal inherited and most cases of hybridization in the wild seem to occur between a female wolf and a male domestic dog, these results may not be reliable.
==Description==
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 10,000 years ago and have interbred only occasionally since; thus imbuing the dissimilarity between dogs and wolves in behavior and appearance.<ref>http://www.sciencemag.org/cgi/content/abstract/276/5319/1687 Vila, C., Savolainen, P., Maldonado, J. E., Amorim, I. R., Rice, J. E., Honeycutt, R. L., et al. (1997). Multiple and ancient origins of the domestic dog. ''Science 276''(5319), 1687-1689. Retrieved December 21, 2006</ref> In many cases the resulting adult wolfdog may be larger than either of its parents due to the genetic phenomenon of [[heterosis]] (known to laypersons as ''hybrid vigor'').<ref name="Controversy" /> 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.<ref>[http://www.defra.gov.uk/wildlife-countryside/gwd/wolfdogs/wolfdogs.pdf DEFRA - RSPCA report on wolfdogs]</ref> In some cases, the presence of [[dewclaw]]s is considered a useful, but not absolute indicator of dog gene contamination in wild wolves. Dewclaws are the vestigial fifth toes of the hind legs common in domestic dogs but thought absent from pure wolves, which only have four hind toes.<ref name="AP" /> 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.<ref name="Graves">{{cite book | author = Graves, Will |url = http://www.wolvesinrussia.com/ | title = Wolves in Russia: Anxiety throughout the ages | year = 2007 | pages = pp.222 | id = ISBN 1550593323}}</ref> High 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".<ref name="Times">''The Wolf Inside Every Dog'' from ''The Times'', London, 16 November 1994</ref>
== Health ==
Wolf-dog hybrids are generally said to be naturally healthy animals, and are affected by less inherited diseases than most breeds of dog. Wolfdogs are usually healthier than either parent due to [[heterosis]].<ref name="Controversy" /> 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 [[Prescription drugs|extra-label]] use of the vaccine.<ref>[http://www.defra.gov.uk/wildlife-countryside/gwd/wolfdogs/wolfdogs.pdf DEFRA - RSPCA report on wolfdogs]</ref> Wolfdog owners and breeders purport that the lack of official approval is a political move to prevent condoning wolfdog ownership.<ref>[http://www.geocities.com/wolfdogproject/rabies.html The WolfDog Project QandA]</ref>
== Temperament and behaviour==
[[Image:Saarlooswolfhond.jpg|thumb|The [[Saarlooswolfhond]]]]
Wolf-dog hybrids are a mixture of genetic traits, which results in less predictable behavior patterns compared to either the wolf or dog.<ref name="Controversy" /> This is not to say that the behavior of any specific hybrid is erratic. It would, however, be unlikely that someone unfamiliar with an individual animal would be able to predict that animal's behavior with reasonable certainty. 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.<ref name="Controversy" /> Thus, though the behavior of an individual wolf hybrid may be predictable, the behavior of the type as a whole is not.<ref name="Controversy" />
According to the [[Centers for Disease Control and Prevention|CDC]] and the [[Humane Society of the United States]], the wolfdog ranks sixth in the number of [[dog attack]] fatalities in the U.S.; with 14 hybrid-related fatalities between 1979 and 1998 in the United States.<ref>[http://www.cdc.gov/ncipc/duip/dogbreeds.pdf Breeds of dog involved in dog attack-related fatalities in the U.S. between 1979 and 1998]</ref> <ref>[http://www.defra.gov.uk/wildlife-countryside/gwd/wolfdogs/wolfdogs.pdf DEFRA]</ref> In 2000, DEFRA and the [[RSPCA|Royal Society for the Prevention of Cruelty to Animals]] released a lengthy study that attributed much of the reported aggressiveness of wolfdogs to the characteristics of the breeds of dogs the wolves are bred with. With both wolves' and dog's social habits revolving around a [[Pack (canine)|pack]] structure, wolfdogs may not show the dog's natural acceptance of humans as the dominant pack members, possibly resulting in physical confrontations.<ref name="Controversy" /> Some purport that attacks may not even be caused by typical behavior patterns of aggression and dominance present in either parent species, but instead may be related to [[predation|predatory instincts]], as the majority of attacks involve small children.<ref name="Controversy" /> Between 1981 and 1999, there have been 38 severe attacks and 13 fatalities caused by wolf hybrids in North America, with all victims being children.<ref name="Attacks">{{cite web | url= http://www.nina.no/archive/nina/Publikasjoner/oppdragsmelding/NINA-OM731.pdf | title= The Fear of Wolves: A Review of Wolf Attacks on Humans | publisher= Norsk Institutt for Naturforskning | accessdate= 2008-06-26}}</ref> An officer in the South African Defence Force once commented that it was very difficult to dissuade wolf hybrids from pressing an assault once an attack was initiated.<ref name="Times" />
Most wolf and wolfdog rescue organizations maintain wolfdogs retain many of the traits and requirements of their wild relatives and therefore may be inappropriate as domestic pets.<ref>[http://www.fws.gov/midwest/wolf/biology/qandas.htm Gray Wolf Biology Q&A from U.S. Fish and Wildlife Service] - see item 25</ref><ref>[http://www.wolfsongalaska.org/wolfdogs_children.html Wolf Song of Alaska]</ref> 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.<ref>[http://www.inetdesign.com/wolfdunn/wolfdogfaq/pets.html The Wolf Dunn's Wolfdog FAQ - Question #1]</ref><ref>[http://www.wolf-to-wolfdog.org/index1.htm The Wolf Is At The Door, Inc.] A non-profit focused on public education regarding wolfdogs</ref> Proponents of wolfdogs as pets say that the animals are naturally timid and fearful of humans, but that with proper training and responsible ownership wolfdogs can become good pets.<ref>[http://www.geocities.com/wolfdogproject/bite.html The WolfDog Project: teaching bite inhibition in puppies]</ref> <ref>[http://www.wolf-to-wolfdog.org/index1.htm The Wolf Is At The Door, Inc.] A non-profit focused on public education regarding wolfdogs</ref> Even in cases of wolfdogs displaying consistently dog-like behavior, they often retain the wolf's natural curiosity; driving them to dig ferociously, chew up household items such as furniture and display extreme difficulty in [[housebreaking]].<ref name="Controversy" /> <ref>[http://www.geocities.com/wolfdogproject/QA2 The Wolfdog Project QandA]</ref>
== Breeds ==
[[Image:Wolf-malamute hybrid.jpg|thumb|200px|A wolf-dog hybrid that has [[malamute]] ancestry]]
Today, four breeds of dog exist that utilized a significant amount of recent wolf-dog hybridization in their creation. All of the breeds were the result of intentional crosses with [[German Shepherd Dog]]s, and have distinguishing characteristics of appearance that may reflect the varying subspecies of wolf that contributed to their foundation stock. The intention in creating the breeds was manifold; ranging from the desire for a recognizable companion wolfdog, to military working dogs. The eldest breed, the [[Saarlooswolfhond]], traces its origins to the efforts of a [[Netherlands|Dutch]] breeder in 1921. This first attempt at sustained wolf-dog crossing was to improve Shepherd breeding stock and prevent [[canine distemper]]. Though this effort failed, today the [[FCI]] and the [[Dutch Kennel Club]] both recognize the breed. In the 1950's, the [[Czechoslovakian Wolf-dog]] and the [[Kunming Wolf-dog]] were created, the latter as a working military dog.
== See also ==
*[[Coydog]]
*[[White Fang]]
*[[Tamaskan dog]]
==References==
{{reflist|2}}
==External links==
*[http://www.renokeo.com/wrr.html Wolfdog Rescue Resources]
*[http://www.wolf-to-wolfdog.org/news.htm News Articles related to wolfdog hybrids]
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[[Category:Wolf-dog hybrids| ]]
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