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: 38-52cm, recommended approx. 10-20 kg;L: 48 cm above, recommended approx. 17.5 kg above;endly, 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, quick-release safety buckle, adjustable according to head size, does not fall off easily. The muzzles can completely cover the dog's mouth to avoid biting, barking and licking. It has eyelets and does not block the view of the dog. It is suitable for daily trips, training, walking, visits and outdoors. The perfect design is designed for flat and short mouth dogs that are suitable for English Bulldogs, French Bulldogs, Pugs, Boston Terriers, Shar Pei, Pugs and other short snout dogs.