Real Leather Dog Basket Muzzle #113 Black (Circumference 16", Snout Length 4") Mastiff, Newfoundland Well-ventilated, light and durable. This size generally most suitable for Large breeds . Well-fitting, comfortable muzzle is made of high quality genuine leather, trimmed and riveted for extra strength. Dog snout measurements: circumference 16", length - 4". Adjustable leather straps wouldn't stratch.