Stop doing so much with your dog, listen I am not against doing things with your dog and I am a big fan of exercise with your dog, i just feel that so many folks feel they have to do more and more and more to the point that if they don't they feel guilty.
its more about folks feeling they need to work their dog to exhaustion in order to get good behavior (A tired dog is a well behaved dog) which actually is the farthest thing from the truth, a well behaved dog is a well behaved dog.