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Since he is not allowed to exercise at all, we are allowed to do swimming with him. I took him to the dog aquatics pool and he enjoyed his 20 min swim but he will have to be muzzled in future to go there because of his biting and mouthyness or I will have to set up private swims for him. At least he got some exercise and I hope after some sessions he will back off with his aggression because he is so full of energy and so bored, that he is out of control again. I just hope this helps some, right now he is sleeping so it tired him some at least. Fingers crossed that this brings improvements.