I think you doing fine. I would end the lease if it is a yearly lease when that time frame comes up. My reason would be the dog issue. But I would use the some reason like remodeling the property or selling, or relative relocating. I keep my house temp at 65 before my heat kicks on. I might help a little on the electric bill if you feel like it. But I would suggest if the T don't like the home. He can move. Next lease period raise the rent.