Our dog muzzles are with unsealing design and adjustable loop, which are breathable, will not make pets feel sultry when worn, the tightness can be adjusted at will, making it cozy to wear. Not only can the pet dog muzzles limit the dog's not good habit of chewing and biting furniture, but also prevent pets from biting people, eating garbage and barking at random. It is constructed of polyester material. There are four different sizes to choose from: S, M, L, XL. Suitable for dogs with various mouth sizes, and for outdoor, training, walking dogs, travel, etc. Item Name: Dog Muzzle Material: Polyester Usage: Prevent Bite Features: Reusable, Adjustable, Breathable Size Details: Size: S, Mouth: 19.5cm-24.7cm/7.7"-9.7", Neck Circumference: 27.5cm-33.5cm/10.8"-13.2" (Approx.) Size: M, Mouth: 24.7cm-30.5cm/9.7"-12", Neck Circumference: 32.5cm-43.7cm/12.8"-17.2" (Approx.) Size: L, Mouth: 29.5cm-37.5cm/11.6"-14.8", Neck Circumference: 42.7cm-53.5cm/16.8"-21.1" (Approx.) Size: XL, Mouth: 35.5cm-45.7cm/14"-18", Neck Circumference: 52.5cm-65.5cm/20.7"-25.8" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Dog muzzle