Don’t be cruel to your dog or excessively harsh with the discipline, but let your dog no when he bites you too hard. If you dog bites you hard, pull your hand away immediately and say “ouch,” or “bad dog,” or something like that. Let him know that he has hurt you. Most dog biting problems have a physiological cause behind them. You see, dogs don’t only bite when they want to hurt something. They bite something if they want to hold onto it, they bite to play, and they bite as a way to warn people or other dogs do not go any further. The problem is that dogs have thicker skins than people. Your dog thinks of you as just another dog, so he can easily bite through your skin accidentally. If you don’t address the dog biting problem while he is still a puppy, it can become serious.