If you are breeding a bitch and a dog that share a sire it is inbreeding. Inbreeding should be left only to the most experienced breeders. It will bring out the best and the worst in the sire of the two dogs. One must know the line very, very well to know whether the worst that could come out is worth the risk. I would highly advise against inbreeding. Even if the shared sire is the #1 yorkie in the country it's still not something a novice should attempt.
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Tami |