5 sizes: XXS, XS, S, M, L. Please measure your dog's mouth and neck circumference before purchasing. XXS: 19-27 cm, recommended approx. 2-5.5 kg; XS: 26-34 cm, recommended approx. 4-8.5 kg; S: 30-42 cm, recommended approx. 7-12.5 kg; M: 38-52 cm, recommended approx. 10-20 kg; L: 48 cm and above, recommended approx. 17.5 kg and above. Friendly, soft and comfortable, breathable and cool, non-irritating. Three-hole design allows dogs to breathe freely, refreshing and easy to clean. Design: The special design with soft edges prevents the mesh from rubbing on the dog's eyes and nose. Adjustable nylon strap with quick-release safety buckle, adjustable according to head size, does not fall off easily. The muzzle completely covers the dog's mouth to help prevent biting, barking, and licking. It features eyelets that do not block the dog's view. Suitable for daily trips, training, walking, visits, and outdoor use. Perfectly designed for flat-faced and short-mouthed dogs, suitable for English Bulldogs, French Bulldogs, Pugs, Boston Terriers, Shar Peis, and other short-snout breeds.