I took her to a class when she was about a year and half. she was so out of control and I struggled even handling her. She still has times when she just won't follow directions. I still have trouble with her jumping up on people and she just won't leave them alone. she has done much better with this collar, she knows that when I say no or stop ,she now knows I mean what I say. It may look like this collar isn't acceptable but when you can't control her and she won't follow directions, I need something which shows her she needs to follow directions. Believe me I tried several other collars and none worked. I know not many agree with using this collar, but I can control her behavior much better and she isn't being hurt.