Crazy Felix Nylon Dog Muzzle for Small Medium Large Dogs Poodle Labrador Golden Retriever Doberman, Air Mesh Breathable and Drinkable Pet Mouth Guard for Anti-Biting Chewing Scavenging(M, Pink)Dog Muzzle Medium Sized Dogs: The selected size is M, with snout circumference of 9'' to 10. 5''. Suitable for Husky, Border Collie, etc. Every dogs snout is unique, please Measure Before Purchasing. Don't select a size based on breed or previous orders. If your dog's measurements are between two sizes, please choose the smaller size. (Note: Not for fierce dogs, overactive dogs, or short snout dogs.) Patience and Positive Reinforcement in Training It