Bests & Worsts Reviews from Amazon

We used this collar last year on our yellow lab without any issues. I just put on a new one a week ago and it had a horrible reaction. We didn't notice it for a couple of days because it was all only under his neck. The skin became bright red and there was goop everywhere. Some hair chunks fell out as well. In the days leading up to the discovery our lab very activity very odd and depressed. We hope he will recover soon. We're trying to get a refund and have tried to contact Bayer. Won't risk using this product again!