Double Track™ Coupler LeashRuffwear Double Track Coupler leash for two dogs Good News for owners of two dogs: You can now easily lead your two dogs with the Ruffwear Double Track Coupler. Do you have two dogs approximately the same size and the leashes are always tangled? Ruffwear provides the solution. With the Double Track Coupler coupling two dogs is easier than ever before. Thus, both can be kept on one leash. The Knot a Long Leash is ideal for that. Simply attach the