Caleb was a biter when I got him. It was a process. I make sure he has plenty of HIS things to chew upon. Then, when he tries to chew on me, I say NO! sharply and get his attention. The latest thing I did that really cut it back was I taught him to close his mouth. It only took 3 x ... first I told him to Close his mouth, and took my hands and closed his mouth for him. ONce he paused, I gave him a treat. By the third time, he closed his mouth by himself and got an immediate treat. Caleb is still on the treat end of it, but I know soon he will do this without having to get a treat.