Dog Japan Quack Muzzles 3 Color Yellow Pink Khaki S: mouth circumference 4.1-Incn, Neck 4.7to11.8-Incn, muzzle height 1.8-Incn, weight 0.12-LB M: mouth circumference 6.1-Incn, neck circumference 5.5 to 13.3-Incn, muzzle height 1.77-Incn, weight 0.18-LB L: mouth circumference 6.5-Incn, neck circumference 6.7 to 15.8-Incn, muzzle height 3-Incn, weight 0.3-LB The main function: to prevent biting assault- Preventing you eat something To prevent nuisance barking- Prevent chaos licking wounds