Size M: Snout Circumference: 10.23-11.8 in (26-30cm), Mouth Length: 3.54 in (9cm), Head Circumference: 10.2-20.5 in (26-52cm). Measure snout girth and length before purchasing. Leaves a snug enough space for your pup. Flexible & Tough Secure Dog Muzzle: Tough & Durable safe rubber material, yet the material is soft and skin-friendly for your dog. Reinforced nylon strap with anti-slip design to secure on dogs' mouth. Breathable and Lightweight Basket Muzzle: More space allows drinking, panting freely, reward training, and even being fed treats with wide holes design of this dog basket muzzle, allowing for maximum ventilation to prevent your dog from overheating. Lightweight and no peculiar smell. Adjustable & Comfortable: Adjust using the nylon strap of the muzzle for comfortable wearing and better fit. Reinforced strong strap ensures safety. Perfect for dog outdoor and indoor exercise, training, and walking. Convenient & All-around protection basket structure - Quick Fit Muzzle with soft padded nylon belt, easy to put on and take off. This unique basket muzzle provides all-around protection for dogs' mouth and helps you manage barking, biting, and chewing. Confident Buy Muzzles: 100% Money Back Guarantee or replacement. Please kindly measure your pet first to choose the best suitable size. If you have any questions regarding this muzzle, feel free to , we will provide the best service to satisfy you.