Most of these dogs are bought from puppy mills. A reputable breeder is your best choice. There is no license required to breed dogs.
Registration papers are only as good as the reputation of the person who bred the puppies.
Make sure the person from whom you buy your special puppy is qualified to make the best possible decisions about the breeding and rearing of puppies. There is no fail-proof method for identifying reputable breeders, but there are some key qualities shared by them. Reputable breeders are knowledgeable. They have studied their breeds for years and are involved with both local and national breed clubs. They usually actively show dogs.