I would not support breeding a chihuahua and a great dane or other designer breeds. I am speaking of a coat colour. Breeding other markings that the breed comes in is not creating a new breed nor changing anything about the build or health of the dog. It doesn't change the type or the working ability. The ONLY thing that changes is the coat colour. It is unnatural for labradors to come in yellow, chocolate, and black. It is line breeding done by show breeders. It is natural for labradors to come in other colours. So why not line breed a b&t or a brindle or a dilute colour? The only logical reason to not accept these dogs is because of the colour, because color is the ONLY difference in existence. You can't logically bring in any other arguements. Anything other arguement is irrational.