Makes Walking Fun! The 1" wide no-pull harness features a patented control loop on the back of the harness, which tightens gently around your dog's chest to discourage pulling and makes walking your dog an easy, more enjoyable experience. Includes a leash! Fits Great! To measure for the harness, use a soft measuring tape (or a piece of string) and measure all the way around the LARGEST part of your dog's chest (right behind the front legs). Choose the SMALLEST size that fits within that measurement.