I've been reading a lot of posts on here educating myself but I didn't see these questions asked. Hopefully someone can help!
Why do people only stress breeding AKC yorkies only? I understand that more AKC dogs are the "breeding quality" than the rest, but for dogs registered into different registries or no registries at all, wouldn't they also have breeding quality yorkies as well? As much as one cannot state that every AKC yorkie is a show quality dog, one cannot reject a non-registered dog for breeding when it may be a quality, healthy dog that can also help improve the breed. so I am also confused on why AKC does not allow a dog to register as AKC if it meets the AKC standards of that certain breed unless the parents are both AKC's.

Or is it that a healthy, quality yorkie cannot ever be born under pet quality yorkies?
Also, I've read here that studs become less pet quality after breeding. Is there any change with females?
In breeders' houses with many unneutered nor spayed yorkies, how do the breeders keep the females from becoming pregnant? do they have to constantly watch for the females heat in session and keep the male yorkies physically away?
Thank you!