The SENSE-ible Dog Harness is an easy to use no-pull dog harness. The front-leash attachment design gently stops dogs from pulling, without causing or strain on your dog’s neck. Instruction Booklet Easy to use right away Quality hardware and construction Nylon curved side-release buckle and belt loops Nickel-plated metal slide adjuster Sizing For the SENSE-ible Harness a flexible measuring tape (or leash), measure from just behind the front legs all the way around your dog, similar to a chest or belt measurement on a human. This is your dog’s girth measurement. X-Small: 3/8 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: 3/4 Inch Webbing (32-40" girth Large: 1 Inch Webbing (32-40" girth) X-Large: 1 Inch Webbing (39-50" girth) The Original Front-Leash Attachment Harness. Gently teaches your dog to walk at your side. Durable construction. Make your walks more enjoyable!