The best all in one soft harness. Easy, safe, and comfortable to wear. It features buckle-less step-in design that is secured by a simple slide down clip. Matching lead is included. Product Sizing Information: X-Small – 7″-9″ Length, 7″-9″ Neck, 11″-14″ Chest Girth Small – 9″-11″ Length, 9″-11″ Neck, 14″-17″ Chest Girth Medium – 11″-13″ Length, 11″-12″ Neck, 17″-19″ Chest Girth Large – 13″-15″ Length, 12″-14″ Neck, 19″-21″ Chest Girth Measuring Guide: Back: Measure length of pet’s back from the base of the neck to the base of the tail. Neck: Measure the circumference of the pet’s neck for a snug, not tight fit. Chest Girth: Measure the broadest part of the chest. Note: If the dog has a stout build, select one size larger.