EUGENE M. MCCARTHY, PHD GENETICS, ΦΒΚ
The big red wolf of the South American plains is not closely related to the northern wolves; and it was to me unexpected to find it interbreeding with ordinary domestic dogs.
Through the Brazilian Wilderness
The occurrence of hybrids between dog and maned wolf (Canis familiaris × Chrysocyon brachyurus) is poorly documented. There seem to have been no DNA studies of any of the alleged hybrids, nor have there been any formal reports of this cross. However, such information as I have managed to collect on the subject appears below.
In his book Through the Brazilian Wilderness (1921, pp. 76-77), Theodore Roosevelt, who was not only the 26th President of the United States, but also a respected naturalist, says that during his travels in South America he encountered hybrids of the ordinary dog with the maned wolf. The following is an excerpt from his account of a jaguar hunt on the Taquari River in southern Brazil (Rio Grande do Sul): “The dogs were a wild-looking set. Some were of distinctly wolfish appearance. These, we were assured,
Maned wolf adults weigh 20 to 34 kilograms (44 to 75 lb), about the same as an average dog. The range of Chrysocyon extends over much of southern Brazil, as well as adjacent Argentina, Bolivia and Paraguay. The chromosome count of domestic dogs is 2n=78, whereas that of Chrysocyon is 2n=76. Both have a gestation period of nine weeks.
To the above information can be added a comment from an anonymous, apparently Brazilian, participant in a forum on wolves (www.orkut.com):
In another forum (br.answers.yahoo.com), another anonymous Brazilian participant says:
A YouTube video shows a half-grown puppy of which the owner says
But the puppy in question has all the appearance of being a pure German shepherd and does not have any evident traits of a maned wolf, except perhaps for its large ears (it's true, however, that in some crosses, the offspring resemble one parent when young, but the other when mature).
Another site displays a photo of a dog with a red coat and black muzzle (both as in maned wolf), labeled "Cruzamento de Lobo guara com vira-lata" (cross between a maned wolf and a mongrel dog). But no explanation or details are given. Moreover, it is not evident from the picture itself whether this animal is a dog x maned wolf hybrid or not.
The following is a list of reported dog crosses discussed on this site. Some of these crosses are much better documented than others (as indicated by the reliability arrow). Moreover, some are extremely disparate, and so must be taken with a large grain of salt. But all have been reported at least once.
Human Origins: Are we hybrids?
On the Origins of New Forms of Life
Cat-rabbit Hybrids: Fact or fiction?
Georges Cuvier: A Biography
Prothero: A Rebuttal
Branches of Biology