Size M: mouth length 4cm, mouth circumference 12-16cm Size L: mouth length 6cm, mouth circumference 16-22cm Size XL: mouth length 7cm, mouth circumference 22-26cm Size XXL: mouth length 9cm, mouth circumference 24-32cm Breathable & Comfortable: Made of premium mesh materials, our dog muzzles provide excellent ventilation for dogs to breathe, soft yet highly durable for long-term use. Thanks to the soft edges and its lightweight, this soft muzzle for dogs is skin-friendly and has zero pressure for dogs to wear. Adjustable & Secure: With double-layer Velcro, the dog mouth guard is fully adjustable and it is ideal for growing puppies. The easy-on quick-release buckle and slider buckle that is built-in for threading the extra part of the neck strap ensures the soft dog muzzle is more anti-slip and stays in place. Dog-friendly Muzzle: Compare to a heavy basket or a fully closed muzzle, our open-snout dog mouth cover is easier for gear-shy dogs to accept something on their face. While wearing the dog muzzles for medium dogs, your dog can pant, drink freely and even be fed. Its ultimate comfort helps dogs reduce anxiety when cutting nails or bathing. Great Helper in Your Life: If used properly, this large dog muzzle can help to prevent dogs from biting, nipping, destroying, fighting, and digging. Since it is quite lightweight and highly carry-on, the small dog muzzles are ideal for grooming, dog walking, muzzle training, vet visits, trimming nails, etc. It is suitable for Maltese, Schnauzer, Chihuahua and so on. But not suitable for short-snout dogs such as Pitbull and Boxer.Products from Bazhou's store