Backyard cloning

When a bunch of dogs all look the same, it is easy to think of them as different from other dogs - to think of them as a breed.

By isolating the in season female dogs, (during the time they are able to get pregnant), and only permitting a male dog who looks like the her, to breed with her, PEOPLE separate dogs into groups of dogs that look the same.

These inbred dogs can be marketed as a breed of dog, because they "breed true" - the puppies will grow up to look like their parents.