Kwik Klip Adjustable Nylon Muzzle Size 2The most comfortable muzzle you can buy. Soft and flexible will not pull hair or pinch dog. Head strap is adjustable. Kwik Klip allows for easy placement and removal. Made with reinforced nylon.Available SizesSize 0 4 Generally fits tiny breeds Yorkie Toy Poodle. Approximate weight 8 lbs.Size 1 4.25Generally fits Miniature Poodle Westie Fox Terrier. Approximate weight 925 lbs.Size 2 6Generally fits Beagle Cocker Spaniel. Approximate weight 2550 lbs.Size 3 7Generally fits German Shepherd Boxer Lab. Approximate weight 5080 lbs.Size 4 9Generally fits Great Dane Saint Bernard. Approximate weight over 80 lbs.Size 4XL 11.25Generally fits Rottweiler Bull Terrier. Short wide muzzle.Size 5 8.5Generally fits Xlarge dog Wolfhound. Long muzzle.Size 5XL 10Generally fits Xlarge dog Wolfhound. Long wide muzzle.