"We bought this bark collar because our neighbor left a note on our door telling up that our dog was barking while we were at work and she couldn't stand it anymore.... So we went to Petco and bought the Deluxe Bark Collar. The first one we brought home didn't even turn on... We sent that one back and got a new one. We put it on our cocker spaniel today and he didn't even notice it! He would shake his neck and the collar would go off to the side... If the collar doesn't sit right on the vocal cords it doesn't work. I don't think that it was working every time he barked either. This collar really doesn't work!!! Don't waste your money!"