Keep in mind breeding two unrelated yorkies can also bring in unknown genetic problems too. Breeding yorkies is not breeding pheno type to pheno type. Most breeder/exhibitors line breed, however you must know where the cut off is and where it turns into inbreeding. Only the very experienced breeders inbreed, it's the fastest way to set type, but it can also backfire and bring out those problems fast too. In other there is no short cut. One must study and I don't mean reading books. Take some classes/seminars, etc. Even with repeat breedings each litter is different, it's just how the genes shake up. Whether showing or breeding never breed anything with more than 3 faults.
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