Okay, so I don't know about breeding yorkies...but...we have Nubian goats, and you in-breed that way, 5 generations, and you can then register them as purebred Nubians again. My husband handles all this, so I do not remember exactly how you do it, but I do know brother+sister is a big no-no, but I do know that mother+son is one way to do it. |