Blueberry Pet Harnesses Small Dogs Classic Solid Padded Dog Harness Vest Chest Girth 17-21", Neck 14", Chest Strap 7"; The chest strap is not adjustable. For a safe and fit purchase, be sure to check the neck and chest; A properly fitting collar and harness won't leave any room for your dog to chew. The harness does not stretch itself. NEVER leave your dog unattended with a harness on. The durable canvas outer lining and fleece inner lining feel so soft. This harness is a single product. However, it comes with matching collar/leash to complete the look. Collar and leash sold separately. This dog harness fits small to medium size dogs. All pictures are taken with our production samples from a size 14" (neck) * 17-21" (chest).