Perfect Design: The Design Gives Dog Full Mouth Coverage, Avoid Biting, Barking And Licking, Or Eating Dirty Food From Outside. Suitable For Daily Outings, Working Out, Walking And Other Outdoor Activities Breathable & Comfortable: Fully Breathable Mesh With Exquisite Edge, Prevent Mesh From Rubbing On Eyes And Nose. It Is Convenient For Dogs To Breathe Freely, No Overheating, Easy To Clean Adjustable Strap: The Adjustable Nylon Strap With A Quick Release Buckle, The Safety Buckle Is Not Easy To Fall Off And Can Be Adjusted According To Your Head Size Durable Material: Made Of Breathable Mesh And Durable Nylon, Skin-Friendly, Soft And Breathable, Odorless, Irritant-Free, Makes Dog'S Muzzle Comfortable Suitable For Small-Medium-Large Dogs : There Are 4 Sizes To Choose From: Xs, S, M, L. Xs Size Neck Circumference: 14.2-18.9 Inches, It Is Recommended For Dogs Under 6-9Kg. Size S Neck Circumference: 14.2-18.9 Inches, It Is Recommended For Dogs Under 9.5-14Kg. Size M Neck Circumference: 18.9-22 Inches, It Is Recommended For Dogs Weighing Less Than 14.5-21.5Kg. Size L Neck Circumference: 22-25.6 Inches, It Is Recommended For The Dog Over 22Kg