The domestic dog is thought to have descended from the gray wolf, and has since evolved to become the most morphologically diverse mammalian species.
Phylogenetic tree representing the divergence of canine breeds from the wolf.
The many dog breeds recognized today are the result of careful selective breeding for functional attributes deemed beneficial to their human owners including hunting, guarding, and herding and desirable physical characteristics such as skull shape, size, and coat variation.
Genetic studies of dog breeds suggest that each breed is a distinct genetic entity/unit. Consequently we can create genetic signatures that represent each breed. This is how we identify the breed(s) in your dog’s ancestry.