Product Description It's not mean - it's a Softie...the more durable muzzle on the market. The Softie Muzzle has a special insert of welded fishnet plastic mesh. Allows dogs to breathe normally, while restricting unwanted behavior such as biting and chewing. Can be worn during play and exercise. Muzzle slips on quickly, snaps closed and has an adjustable, woven nylon strap. Tough, washable cordura nylon resists tears and punctures, yet feels comfortable to the dog. Softie Muzzles are available in sizes to fit the breeds and similar sized dogs listed below: Small (Miniature poodle, Sheltie, Bichon Frise, Miniature schnauzer, Yorkies, etc.) Medium (Fox Terrier, Beagle, Lhasa Apso, Westie, Jack Russell, Dachshund, etc.) Large (Cocker Spaniel, Boston Terrier, Bull Terrier, Border Collie, Springers, etc.) Extra Large (Husky, Labrador Retriever, Golden Retriever, Setters, Doberman etc.) Giant (Great Dane, Newfoundland, Great Pyreness, St. Bernard, etc.) Please use the following as a guide to help you select the proper fit for you dog: Muzzle Size Circumference1 Width2 Length3 Neck Strap4 Small8"2"3 1/4"Adjusts 10"-22" Medium9 1/2"2 1/4"4 1/2"Adjusts 13 1/2"-22 1/2" Large10 1/2"2 3/8"5 1/4"Adjusts 15"-26 1/2" Extra Large12 1/2"3"5 1/2"Adjusts 12"-31" Giant16 1/2"4"7 1/2"Adjusts 21"-33" 1 Circumference: Measure the circumference midway between the tip of the nose and eyes. Add 2" for small/medium breeds and 3" for large breeds. 2 Width: Measure the width miday between the tip of the nose and eyes. 3 Length: Measure jaw length from the nose to the throat. 4 Neck Strap: Measure neck size at base of neck, just under the ears.