Our Guardian Gear™ Nylon 2-Way Couplers allow you to walk two dogs using just one lead. 4" coupler is designed for small breeds, 12" coupler is for medium to large breeds, and 24" coupler is ideal for the largest breeds. Made of high-quality, durable nylon with heavy-duty swivel snaps in bright and fashionable colors. Nylon 2-Way Couplers are available in the colors and sizes listed below. Basic Colors are: Black, Blue & Red. At this time we are stocking only the 12" used for medium to large dogs. If you need the small 4" or the large 24", we will gladly special order it for you.