Evolution Pretty Paw Designer Step-in Pet Harness Scotland Charcoal (3) Size 3: 10-17 lbs, neck 14"-16", chest 17"-19" Designed to prevent bruising around the pet's trachea area when pulling. The straps adjust to measure the neck and chest girths accordingly to ensure a perfect and comfortable fit. Designed with an easy fasten side-release buckle, which secures your pet into place. The center rings above allow for attachment of a leash for those long and happy walks.