Because I need working dogs I buy from working dog breeders or get pups proven proven working dogs so I dont usually buy ANKC registered dogs. I do have several though from before I moved to the farm. I have a couple that came with guarantees (certificates supplied) of being clear from PRA, CEA, TNS and various other genetic diseases plus hip and elbow scores from their parents.
I did get caught some years ago getting a pup from an ANKC registered breeder who did no screening and the pup was diagnosed at 12 months old with elbow dysplasia. That cost me plenty. You may get lucky or you may get caught with a problem which usually always ends in heartache.
I avoid any breeder that does not have a comprehensive health screening program in place and that includes working dogs. If I do a custom working dog breeding from dogs that havent been screened but have the qualities I want, I generally work with the owners and we share the costs of the health testing along with the other people who want pups from that specific breeding. Generally the lines are well known and working people know well when problems emerge in certain lines because working dogs have to be robust and working hard soon brings out the problems if they are there. If there is any genetic mismatch for a selected breeding it is not done regardless of how much we might like both dogs.
I totally do not condone the mass production of puppies regardless of if they are clean and well fed. The best breeders go for quality, not quantity. This breeding for quantity seems more likely to occur in the breeding of in demand so called designer dogs where prices are ridiculous and demand seems to be high. These breeders have no restrictions about selling to pet shops.
I believe a quality breeder is one who understands structure and temperament, has good knowledge of the breeds genetic diseases and screens accordingly. Pays careful attention to the selection of the pairing of breeding dogs. Uses only the best quality dogs for breeding with the goal of producing healthy, well tempered, structurally sound dogs. A good breeder will socialise and nurture the puppies before they are sold to homes not before 8 weeks old. They will carefully choose the people who buy their pups. They will always with in their capability be able to give advice to owners of their puppies and they will take the puppies back if down the track theire is a problem that may see the dogs end up in the pound. You cant possibly do this when you are mass producing puppies and selling them through pet shops.
These days I am highly selective about where I get my new pups. However I do also take in the occassionaly working dog pup from rescue, but again I carefully look at their temperament and structure and then I insure them for the first couple of years in case a genetic condition pops up.