I had to wear slippers for about 4 months. They eventually learn. If you're playing and he starts nipping, just put him on the floor and say No Bite. This is especially good if you find yourself getting annoyed or angry since you're separating him from your anger. (Anger will just confuse him).
Ian Dunbar writes about bite inhibition. It takes time, but he suggests doing it early. His books are good. |