Tried, Tested & Trusted: The Crazy Collar. I’ve utilised the Crazy Collar as a gentle muzzle when grooming aggressive dogs. Because it’s soft and flexible, dogs can still pant comfortably while it helps keep me safe during grooming sessions. Comfortable, practical, and stress-free—for both humans and dogs. The Crazy Collar has completely changed how I manage grooming situations. I genuinely wouldn’t use anything else.