Sure Fit Muzzle by Proguard Pets Brand: ProGuard Size: 4- Medium Muzzle circumference: 9" Muzzle measures: 3.5" from edge at nose to eyes. Designed to fit these breeds: Cocker Spaniel, Shiba Inu, Chow Chow, Staffordshire Terrier, Standard Schnauzer and American Eskimo.