Size Right Adjustable Dog Harness | 30 to 38 Inches Girth & 1 Inch Width (Black) Size Right Adjustable Nylon Dog Harness. Color: black. Adjustable girth size: 30" - 38". Features a comfort pad with a swivel o-ring. Designed for dogs that try to back out of a harness. Just place it over the dog's head, snap the buckle around the girth with our contoured snap-lock buckle.