CollarDirect Dog Muzzle Pitbull Amstaff Basket Genuine Leather Staffordshire Terrier A handmade Dog Muzzle. Intended for Staffordshire Terrier, AmStaff, Pit Bull and other breeds. Has adjustable straps. Made out of genuine leather. Please measure circumference and length of your dog's snout. A - is circumference of dog's snout. B - length of dog's snout. A is 13". B is 4". If you have any questions please do not hesitate to contact us.