Standard Nylon Muzzle - Cocker Spaniel For dogs 25-40 lbs - 6" Royal An expanded line of quick-release muzzles. SAFETY - Muzzles fit securely with quick adjusting straps for a snug fit. COMFORT - Lightweight nylon feels and looks more professional than gauze roll. QUALITY - Reinforced stitching to assure long-lasting use. Available in 18 sizes. Snout circumference is the best measurement for determining muzzle size.