Do you have to walk more than one dog? This nifty invention prevents tripping over leashes and controls the animals by keeping them close together, to walk in unison and in a controlled, orderly manner. One coupler connects to a leash in center O-ring and allows you to walk both dogs at the same time, using only one (1) leash. You may opt to add a matching leash at the same time. Scroll down to see sizes below and learn more! Once you know your size make all selection in the menu options!