Size 1, fits snout measuring 13cm , Easy Measuring Instructions: measure around the snout (under chin and over the top of the snout), take the measurement as close to the tip of the nose as possible, this will give you the snout size.When you need to gently restrain an injured or aggressive dog, this comfortable humane muzzle is your best choice.Quality grooming muzzle, a top choice for professional groomers and handlers.Fully adjustable strap with quick-release buckle.Machine gentle wash cool, tumble dry on low.Remember: never leave your dog unattended while wearing muzzle.Professional packaged with the Downtown Pet Supply Trademarked Logo