I've been having great success using this method for correction with my 12 wk old Ace:
every time he is trying to bite something or gnaw on your hand, place him on his tummy gently with a firm No or Stop! I make my hand into a shape of a claw, put it close to his neck and gently turn him over, making him be submissive. He has significantly stopped snapping at my kids and gnawing on my hands. I had all my family use this method to keep it consistent. So far so good. You can also try an empty water bottle with coins in it and shake it every time he try's to bite something he's not suppose to. Also redirect him and give him his toy.
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