This is a "standard roman-style" harness that goes over your pup's head and has a quick release buckle on the side. D-ring is on top near the middle of your pup's back for leash attachment. Also includes an adjustable piece on their stomach for additional custom fit. Harnesses put less pressure on your dog's throat and trachea when walking. The distribution of weight while walking helps prevents your dog from choking themselves, and can make your dog enjoy walks.