The World's First Dog Collar and Bottle Opener in One. It's a simple black nylon dog collar with a retractable metal and plastic bottle opener attached...turning your pup into a four-legged bottle opener! Fetch me some beer takes on a whole new meaning with the Bark4Beer Dog Collar! This little puppy will be the life of any party in no time. Made from recycled woven nylon. Rust free metal bottle opener. Sturdy D ring for leash attachment. Plastic quick-snap buckle. Adjustable. Matching leash sold separately. Sizing Information: Medium: Fits necks 14"-18" Large: Fits necks 17"-24"