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For the record, below is the controversial text which these morons think needs citations:

The Coyote (canis latrans, or ""prairie wolf"") also interbreeds with dogs, and many Americans have dogs which are part coyote. The coyote is very closely related to the wolf, and the two can be made to interbreed, but they never do in the wild. Most dog/coyote hybrids are in the domestic population, where the father is the coyote responding to a female dog in estrus, and the puppies are born into captivity. The word coydog was coined in the Eastern US when coyotes began to appear there, as they seemed larger than western coyotes, and it was assumed that they were dog/coyote hybrids. DNA evidence has shown, however, that this is not the case. The Golden Jackal is another wild wolf-like canid which can interbreed with dogs, and it has been crossed with dogs by Russian breeders to created the Sulimov Dog.

Any species of the Canis genus has 78 chromosomes and can interbreed with dogs. These include all varieties of the wolf, the golden jackal, the coyote, the dingo, and the New Guinea Singing Dog. The only 78-chromosome canid which is not thought to have contributed to the dog gene pool is the African wild dog, which is in a separate Genus. However, the vast majority of the DNA in dogs comes from the various Canis lupus varieties. Yellow jackals have 74 chromosomes and don't interbreed well with dogs, and other wild canids such as the bush dog, the maned wolf, and the fox, have different chromosome sets and cannot interbreed with dogs at all, so they played no part in the dog ancestry. See canid hybrid.

Finally, the origin of the dog is so ancient that many now-extinct varieties of wolf, some unknown, may have played a part. It is wrong to say that dogs descended from modern wolves. They descended from ancestral wolves, and this difference must always be kept in mind. Ancestral wolves of many varieties existed all over the planet and were most likely domesticated in many places during a period of thousands of years, and some of these ancestors are now extinct. This helps in explaining the different morphological groupings of dog, as each group may have derived from a different variety of wolf. The common belief that greyhounds and other short-haired dogs descended from modern gray wolves of norhtern climates, and lost their undercoat through human breeding, is weak compared to the argument that these breeds descended from a short-haired wolf of warmer climate. The Arabian Wolf, for example, has short hair suited for its climate"