There's a reason why merle chihuahuas and their relatives are not able to registered or are allowed as show dogs:
Because no matter that they look entirely chi at this point, the merle gene came from outside the breed. They are not pure chihuahuas and it is unethical for people to claim that. If I wanted to breed black labs and I bought two purebred black labs... and they had puppies that were parti-colors, I'd be ticked off.
When I buy a corn snake, I want a *corn* snake. I want, to the best of the breeder's knowledge, to have something that has not had intentional non-corn crosses in its ancestry. To make them look 'pure' and then label them as such is also what is known as "lying".
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