Spray bitter apple on your arms and hands to discourage biting. Be careful not to get it into your eyes or mouth. It burns eyes and mouths. It is meant for your puppy, not for you.
Repetition is the key to discourage biting. Each time puppy bites you, cuddle him, restrain muzzle and give a firm “No!” You will be surprised at how fast your puppy responds. Like children, puppies learn quickly what they can and cannot get away with.
Aggressive Biting
Aggression biting is accompanied by growls and a fixed stare. It is not a continuous action, but rather snap, release and retreat. When this happens, restrain the puppy’s muzzle in the same way explained for play biting, accompanied by a loud, sharp, “No!”
Aggressive dogs do not like to be restrained; they like to be in control. This is out of the question. You are the leader of the pack and you have to teach your puppy that you, and only you, have the dominant role.
One way to teach your puppy that you are dominant is to wrap him in a baby’s blanket or towel and lay him in your lap while you are watching TV, reading, or taking part in a conversation with someone. Keep him there for thirty to sixty minutes – until he ceases to wiggle and becomes calm. This sends him a forceful message that says, “I am in control.”
Roughhousing
Never roughhouse with an aggressive puppy. Play more passive and fun games like hide-and-seek, fetch, sniff-out-the-treat, or leash training. It is imperative that aggressive biting has stopped before your puppy is four months old. The longer he is allowed to display aggression, the harder it will be to break him of the habit. In a litter-pack situation, aggressiveness would never be tolerated by puppy’s mother and siblings. He would be promptly reprimanded and put in his place. If he hasn’t stopped his aggressive biting by this time, enroll him in a dominance training course that is taught by a professional. The expensive will be worth it for both you and your pet.