Easy to wear soft harness with one click buckle. Adjustable neck and girth nylon straps. Matching leash is available separately. 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.