What is the Double Dog Coupler? The Double Dog Coupler allows you to walk two dogs on a single lead. The adjustable and patented 'adjusti-buckle', allows you to determine the length of the coupler, enabling you to keep the dogs close together, far apart and to walk dogs of different sizes. Simply attach the coupler to your normal lead and go! How does it work The Double Dog Coupler can be used alongside your normal lead. The patented buckle can be opened, closed and adjusted with ease and then attached. Easy to use Attaches to your normal lead Patented ‘adjusti-buckle’ Fully adjustable lead length The Double Dog Coupler is available in 2 different sizes - Small and Large.