Would You Walk Your Dog More Often If You Could Use Your Smartphone At The Same Time? In today’s busy world, it can be tough to find the time needed to keep your dog happy and healthy with frequent walks. What if you were able to fully use your smartphone for calls, email, texting, etc. at the same time that you are walking your dog? While developing the Leash Belt we discovered an unexpected benefit when using it with strong leash pulling Leash NOT included - works with any standard or retractable leash. Sizing Information. Measure around your hips at their widest point and then order the Leash Belt size where your measurement is within the adjustment range. The Small-Medium size adjusts from 29”-42” and the Medium-Large size adjusts from 35”-54”.