Canid hybrids are the result of interbreeding between the species of the genus Canis. This often occurs in the wild, and in particular between domestic or feral dogs with wild native canids. Genetic considerations The wolf-like canids are a group of large carnivores that are genetically closely related because they all possess 78 chromosomes, arranged in 39 pairs and are karyologically indistinguishable from each other. The group includes the genera Canis, Cuon, Lupulella and Lycaon. The members are the domestic dog (C. familiaris), gray wolf (C. lupus), dingo (C. lupus dingo), coyote (C. latrans), golden jackal (C. aureus), African wolf (C. lupaster), Ethiopian wolf (C. simensis), dhole (Cuon alpinus), black-backed jackal (Lupulella mesomelas), side-striped jackal (L. adusta) and African wild dog (Lycaon pictus). Newly proposed members include the red wolf (Canis rufus), and the eastern wolf (Canis lycaon), subject to a resolution of the dispute as to whether these constitute separate species in their own right or whether they are simply sub-species of the gray wolf (either way, the red & eastern wolves belong to the Canis genus). The members of Canis can potentially interbreed, however, it is believed that Cuon, Lupulella and Lycaon cannot breed with each other or with Canis. The Lupulella genus (the side-striped jackal and black-backed jackal), could theoretically interbreed with each other to produce fertile offspring, but a study of the maternal mitochondrial DNA of the black-backed jackal could find no evidence of genotypes from its most likely mate, the side-striped jackal, indicating that male black-backed jackals had not bred with their sister species. When the differences in number and arrangement of chromosomes is too great, hybridization becomes less and less likely. Other members of the wider dog family, Canidae, such as South American canids, true foxes, bat-eared foxes, or raccoon dogs which diverged 7 to 10 million years ago, are less closely related to the wolf-like canids, have fewer chromosomes and cannot hybridize with them. For instance, the red fox has 34 metacentric chromosomes and from 0 to 8 small B chromosomes, the raccoon dog has 42 chromosomes, and the fennec fox has 64 chromosomes. Legality Dog hybrids kept as pets are prohibited in certain jurisdictions, or are classed as wild animals and must be housed in the same way as purebred wolves. In the United States, legislation differs greatly from state to state. In New York, the law does not allow an individual