The award-winning SENSE-ation Harness gently reduces pulling - without force and without choking your pet. Most dogs love this no-force approach. The SENSE-ation Harness X-Small Narrow SENSE-ation Harness come in one solid color (including belly strap). Measuring: Using a flexible measuring tape, measure from just behind the front legs all the way around your dog, similar to a belt measurement on a human. This is your dog's girth measurement. X-Small (Narrow): 7/16 Inch Webbing (16.5-20.5" girth)