Duke had biting issues, and still to this day when we romp on the floor he will nibble on my arm when he gets over excited playing. It never hurts
he just wants to say I love ya. Anyways........this may sound cruel........but it is a sure cure for any chewing problems. What I did was I went to Radio Shack. I bought a three volt transformer. I have a concrete unfinished basement so I have no fire safety issues. I plugged it in and left the cord on the floor.
Weeeeeell, about 10 minutes later I hear the yapping and Duke came a running up the steps for cover....... never to chew or bite on anything more unless I give it to him.
One bite into that cord zapped him enough to get his undivided attention and made an everlasting attitude adjustment. I unplugged the transformer and threw it away. It was the best twenty bucks I've ever spent. In retrospect I'm glad it was the transformer and not a lamp cord. He could have killed himself and burnt down the house if I hadn't interveined.