The Pet Life fumigation dog muzzle is great for dog owners seeking to help control barking, biting or chewing and great for dog trainers. The fumigation dog muzzle is comprised of thick adjustable and buckable nylon straps and comfortable inner micro-mesh which gently hugs the facial area for a more customizable fit to reduce any pain or discomfort during usage. The exterior features a playful and unique designer animation. Available in Multiple Sizes and Colors.NNSizing Guide: Diameter around the bridge of nose or snout circumference ("In" Inches)NSM: 5.5 to 8" - For Dogs 10 - 25 LBSNMD: 7.5 - 10" - For Dogs 25 - 45 LBSNLG: 9.5 - 14" - For Dogs 40 - 70 LBS Pet Life Adjustable Purple Dog Muzzle for Small Dogs - Comfortable and Durable Nylon Straps - Prevents Barking and Chewing | MZ1PRSM