Hi everybody. I have a female 3yo desexed Golden Retriever and she is aggressive on lead. She growls and lunges at other dogs and sometimes at people. She totally changes when I put a lead on her. Its almost like it turns her hypo. I've taken her to obedience classes, i've tried all different leads and collars, i've tried taking her attention away with food, but nothing seems to work. I even get her tired before we go for a walk. Has anybody ever tried temporary medication for this type of behaviour?