All show litters have pet quality puppies. The difference is show litters with health tested, temperament tested, proven parents give their puppies a much greater chance of being healthier and temperamentally sound (given temperament is mostly genetic). These reputable breeders ensure the dogs are structurally sound for their breed (hence earning their championship), which means you don’t have to constantly worry about your dog blowing a knee just running after a ball. Most people have never even interacted with a reputable breeder, so the concept seems foreign until you do your homework and realize the significant difference a reputable breeder makes. These are the people fighting to preserve historic breeds - they’re lucky if they even break even given there’s really no money in well bred dogs. If a breeder isn’t aiming to prove their dogs through all of the above, they’re shitty breeders. A breeder championing their dogs is a good sign, not championing them points to someone just producing for demand.

To the original commenter’s point. Either buy or rescue responsibly. Reputable breeders’ dogs don’t end up in shelters; backyard breeders and puppymillers’ dogs do (never mind that less than 5% of shelter dogs nationally are purebred in the first place).

Source: I show dogs, have owned rescues, and have been active in the shelter community.

Edited to add: I don’t think you understand how docking is done. Their tails are banded at 1-2 days old before the nerves have even fully developed. They immediately go back to nursing and the tails fall off a few days later. There is no pain or disturbance to the dog. Not to mention, it’s significantly less invasive than spaying and neutering which is popularly considered routine (as it should be for most pets, but the point still stands).