SKL Adjustable Mesh Nylon Dog Muzzle Size S M L Size S:fit for mouth circumference from 6 3/10 inches to 7 6/7 inches (i.e.160mm-200mm) Made of high quality nylon,mesh desigh breathable frabic Adjustable snout with velcro closure;Adjustable nylon strap with buckle, easy to put on Inhibits biting & aggressive behavior;Temporary comfortable restraint Please measure your dog's snout to insure this is the correct muzzle size you need