While you can't stop a puppy from biting completely, you can train it not to bite too hard and to focus its biting on chew toys. Whenever your puppy bites down hard enough to hurt you, yell "Ouch!" or "That hurt!" so it knows you're in pain. Then, pull away and ignore your puppy for a few minutes. Over time, your puppy will learn that biting too hard can hurt people and that it won't get your attention if it keeps doing it. If your puppy is biting on something it's not supposed to, like your ...