Canine Equipment Ultimate Control Dog Harness 2 Nickel plated D-rings provide you with 3 ways to connect your leash for varying amounts of control Front leash attachment redirects your dog's attention when it tries to pull Martingale loop at the back provides gentle pressure to correct walking behavior Use both attachment points with a coupler for the ultimate amount of control Size Medium adjusts to fit a neck size of 15-20 Inch and a girth of 20-28 Inch