If you don't know the answer to this question, you should not be breeding. How will you know if your female has a reproductive problem? Or if either dog has a genetic flaw that will be passed onto the pups?
Do not allow your Yorkies to breed before you find a mentor (a reputable, responsible, ethical, experienced Yorkie breeder) and develop a close relationship with a GOOD vet who will help you every step of the way. Have you had health testing done on your dogs? Shown them? What reason do you have for breeding them?
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