50something dogs is way too many....it seems to be expected in a puppymill but unfortutely I know of show breeders that have that many as well

You've really got to check out any breeder
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~Magnifique Yorkies~
Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue.