The SENSE-ation Harness stops your dog from pulling, without choking, stress or otherwise harming your pet. This no-pull dog harness is a favorite of positive reinforcement dog trainers and conscientious dog owners worldwide. This front leash attachment harness that features a Softouch polyester belly strap webbing for comfort, Duraflex plastic hardware for ease of use, and nickel plated O-rings for durability. The curved side-release buckle and strap adjusters are a nice plus. The girth strap, also called a "belly strap", comes in a coordinating color (except for mini and x-small sizes), making it easy to identify, and therefore easier to put on. There is no acclimation period, and it comes with an instruction booklet to help you and your pet walking easier right away. Price varies by size and color. Before ordering, please measure your dog's girth for a proper fit. Using a flexible measuring tape, measure from just behind the front legs all the way around your dog. You are measuring the circumference of the body just behind the front legs, like performing a chest or belt measurement on a human. MEASURING INSTRUCTIONS: Mini: 7/16 Inch Webbing (13-16.5" girth); X-Small: 7/16 Inch Webbing (16.5-20.5" girth); Small: 5/8 Inch Webbing (20-24.5" girth); Medium: 3/4 Inch Webbing (24-28" girth); Med/Large: 3/4 Inch Webbing (26-32" girth); Medium/Large: 1 Inch Webbing (27-32.5" girth); Large: 1 Inch Webbing (32-40" girth); X-Large: 1 Inch Webbing (39-50" girth) The 1" wide webbing is better proportioned for big shouldered, wide-framed dogs or high energy, reactive big dogs. X-Small and Mini harnesses are designed to be used with light weight leashes/snaps (7/16" or 3/8" wide).