1. Five sizes are available: XXS, XS, S, M, and L. Please measure your dog's muzzle circumference and neck circumference before purchasing. 2. XXS size: Muzzle circumference ranges from 19 - 27 cm, with a recommended weight of approximately 2 - 5.5 kg. 3. XS size: Muzzle circumference ranges from 26 - 34 cm, with a recommended weight of approximately 4 - 8.5 kg. 4. S size: Muzzle circumference ranges from 30 - 42 cm, with a recommended weight of approximately 7 - 12.5 kg. 5. M size: Muzzle circumference ranges from 38 - 52 cm, with a recommended weight of approximately 10 - 20 kg. 6. L size: Muzzle circumference is over 48 cm, with a recommended weight of over approximately 17.5 kg. 7. The material is soft, comfortable, breathable, cool, and non - irritating. The three - hole design allows dogs to breathe freely, and it is refreshing and easy to clean. 8. Design features: - The special soft - edge design prevents the mesh from rubbing against the dog's eyes and nose. - The adjustable nylon strap is equipped with a quick - release safety buckle, which can be adjusted according to the head circumference and is not easy to fall off. 9. This muzzle can completely cover the dog's mouth, preventing the dog from biting, barking, and licking. There are small holes on it, which do not block the dog's line of sight. It is suitable for daily outings, training, walks, visiting friends, and outdoor activities. 10. This perfect design is specifically crafted for flat - faced and short - muzzled dogs, suitable for short - muzzled breeds such as English Bulldogs, French Bulldogs, Pugs, Boston Terriers, and Shar - Peis.