There are many breeders for dogs in the world, but many are illegal or treat the animals poorly. These are called puppy mills. Good breeders take care of the dogs they breed and give them the proper madical treatment like shots, deworming, and removal of dew claws on some. Dew claws are claws higher up on the dogs front legs that are very sharp. They don’t get worn down, so they end up growing back into the skin. These are some problems that dogs from puppy mills have because the breeders don’t care about the dogs they produce. When buying a dog, you need to make sure that you get it from a good breeder.