Actually they do or eventually all we would have left are mutts. Nothing wrong with mutts but there would be no more bloodhounds for police work, no more labs for service dogs, no more GSD for protection. Not to say a mutt can't do these things but they are certainly not going to do it as well as the dogs that were bred for a specific task. Dogs as we know it wouldn't exist.Which part isn't true? A breeder, even a responsible one, doesn't have to breed that litter. They don't have to bring more pups into the world.