Confine and keep him supplied with bullies, pig ears, cow ears, kongs and anything that he can chew on when he wants to chew. Teaching a puppy to chew on acceptable things is very easy. You have to keep them supplied with the appropriate things to chew 24/7, not just when you remember to buy something while out shopping. Chewing for my dogs is what TV is for me, a way to relax. My dogs favorite is the bullie stick. There is nothing in the world they would rather chew.