I agree, try and make some more time to exercise him. If Brody misses one of his walks or one of his play ball sessions...he is an absolute monster! I don't blame him though, he's a growing pup and has a lot of energy. If he can't get his energy out through playing/exercising...he's going to direct it somewhere else...like your couch. Introduce him to playing ball with you. If they are out in the yard by themselves they run around for maybe 2 minutes. That's not exercise. My mom has a huge yard and just lets her GSD roam out there when my step dad can't play with him. She is wondering why her 2 year old who has had alot of training is till acting out...I always tell her, He NEEDS exercise. He's frustrated! People think that we shouldnt have our GSD, Brody, in our townhouse because we don't have a yard. I always tell them, I bet you 1000 bucks he gets more exercise and is more satisfied then someone who just lets their dog out in the backyard. We've found a field by our neighborhood that we bring him to twice a day and play ball with him for about 25 min each time, not to mention his 40 minute walk he gets with me during the late afternoon.