I don't think the puppies would be brought back to the "breeders" because most of those dogs from pet stores come from puppy mills. And it may be hard to locate these puppy mills to send the dogs back. They'd also have a worse life than in the pet store anyway. I know they lower the prices and also send them to other pet stores if they don't get sold at the one they're at. I'm not sure what they do after that if the dog still doesn't get sold. Unfortunately some dogs get put to sleep at some pet stores if they're not sold.