Edwina -- who absolutely HATES being groomed -- tolerates a harness and leash. She has never worn a collar either. I'm not suggesting she LIKES the harness but she knows the only way she can go out in the yard is if she has it on. Very dramatic about it. Walks like a hunch back -- which she forgets to do when she see something interesting to investigate or run toward (or if noone is paying attention). Even though the yard is fenced and someone is with her, I feel better if I can a) catch her, b) see where she is by the trailing leash and c)hear the bell I attached to her harness.