LEOSO Anti-bite Muzzle Dog Mouth Cover Duck Mouth Shape Small size: mouth circumference 12CM, Head circumference 27CM,for 5-9 pounds dogs.Medium size: mouth circumference 15CM, Head circumference 33CM,for 9-17 pounds dogs.Large size: mouth circumference 16CM, Head circumference 35CM,for 17-25 pounds dogs. Advanced silicone material,material is light and soft and elastic, no plastic smell,protect dog's comfort and health. Strap can be adjusted freely and elastic, do not make the dog feel uncomfortable. Prevent the dog bitting, prevent the dog eatting around, prevent the dog licking wounds, prevent the dog barking. Dog wear it Very cute !!!!