Please read this section extremely carefully. I shall repeat over and over: teaching bite inhibition is the most important aspect of your puppy's entire education.
Certainly puppy biting behavior must eventually be eliminated. We cannot have an adult dog playfully mauling family, friends, and strangers in the manner of a young puppy. However, it is essential that this be done gradually and progressively via a systematic two-step process: first, to inhibit the force of puppy bites and second, to lessen the frequency of puppy mouthing.
Ideally, the two phases should be taught in sequence, but with more active puppy biters you may wish to work on both stages at the same time. In either case, you must teach your puppy to bite or mouth gently before puppy biting behavior is eliminated altogether
Inhibiting the Force of Bites