Adjustable Nylon Dog Muzzle No Bite 5.5"-7.5" size Small, Black, Bolognese, Spaniel, Bichon Frise, Well-fitting, comfortable muzzle is made of high quality Nylon. This size generally most suitable for Small and Medium dogs Dog snout measurements: circumference 5.5"-7.5". Please, measure your dog's snout to insure this is the correct muzzle size you need Adjustable nylon straps wouldn't stratch.