We have a 9 month old "buddy" he is a little over 70 pounds. He just can not stop biting us. He has had every toy, every type of bone, but nothing keeps him occupied like our hands. We have tried many different techniques like saying no, and yelling when it hurts. We use bitter apple, but he only stops until it dries and he is back at it. He will stop chewing a bone and bite our hands. What are some other things we can try. Our family is getting tired of this behavior.