The Double Dog Coupler allows you to walk two dogs on a single lead. The adjustable buckle allows you to determine the length of the coupler. This enables you to keep the dogs close together or far apart. It is also useful for walking dogs of different sizes. The Double Dog Coupler can be used alongside your normal lead. It is easy to use simply attach the coupler to your lead and you are ready to go. The Double Dog Coupler is available in 2 different sizes - Small and Large.