My 12 week old male German Shepherd dog has recently started grabbing the nylon webbing portion of his Flexi Lead and shaking it as though we were playing "tug" when I take him for walks. I do not play Tug with him because it encourages aggression and I'm trying to get him to quit play biting (nothing about biting with milk teeth is play to me, or my clothing).
I've tried "NO", loud noise, ignoring and refusing to move, etc. with no result. I'd welcome any suggestions from someone who has managed to resolve this issue.