We are an older couple and just had to have our wonderful border collie put to sleep. We then bought an english shepherd pup - he is now 11 months old - we have had him since he was 6 weeks old. He wants to bite - me in particular. When I take him for a walk he will bite the leash and then me. He is quite strong. He has been to obedience training and did very well in class but was a different dog at home. I am at wit's end. What do I do to stop this behavior?