Sure Fit Muzzle by Proguard Pets Brand: ProGuard Size: 5 - Large Muzzle circumference: 10.5" Muzzle measures :3.5" from edge at nose to eyes. Designed to fit these breeds: American Pit Bull, Border Collie, Bassett Hound, Husky, Samoyed, Springer Spaniel and Wheaton Terrier.