Downtown Pet Supply Basket Cage Dog Muzzles, Adjustable for Small, Medium and Large Dogs - Great for Training, Stops Biting Please measure your dog's snout per listing description below Top measures: 3 1/4" bottom measures 5 1/2" Made of strong flexible plastic, includes comfort strip for the dog's snout Adjustable nylon strap with quick release buckle and comfort strip for the dog's snout Measure the circumference midway between the tip of the nose and eyes, under the chin and over the top of your dog's muzzle