|A young puppy has to learn that biting is not acceptable.|
1) Begin establishing yourself as a leader to your puppy as soon as you bring your puppy home. Do this by beginning training your puppy. Teach your puppy simple commands and reward with treats.
2) If your puppy bites you let him know that he has to be more careful. Yell, 'Ouch', if he bites down....especially loud if it is painful. Remove your hand and give him a toy. If your puppy becomes too rambunctious, put him in his crate or pen to settle down.
3) Do not act like a puppy with your puppy. Children often get rambunctious and encourage puppies to play bite. Tug of war with toys and clothes is not appropriate at this age. The puppy may begin growling and biting the child in this kind of play. Supervise your child with your puppy at all times so you can teach appropriate behavior. Teach your child to play appropriate games and to teach the puppy simple commands. If the child continues to play inappropriately with the puppy, separate the child and the puppy. If this kind of activity continues there is a danger the puppy will in time exert dominance over the child and turn into aggressive biting.
3) The puppy biting should decrease significantly over the months. By 6-7mths of age, the puppy should no longer be mouthing you or anyone.
Here is a video with helpful tips for decreasing puppy biting....