"We have a Pomeranian who barks at anything that moves. After trying the Ultrasonic bark control collar, which would go off randomly at noises other than barking, I was anxious to try Petsafe's new bark control collar. It seemed that it should work; however, the collar will not stay in place on my dog's neck. Even though she has very thick fur, and the collar is as tight as possible, it immediately slips to the side of her neck and is rendered useless since it is not on her vocal cords. I even tried clipping the fur on her neck, no luck. Having had excellent results with Petsafe customer service in the past with other products, I called them and explained the problem. Their only suggestion was to punch an additional hole in the plastic collar to make it fit better. Didn't work, it still slipped sideways. Someone else suggested hot gluing bubble wrap on the inside, didn't work. The problem seems to be with the plastic collar, and since the bark control device is molded into the collar, you can't put it on a better fitting, non-slipping collar."