Sporn Non-Pull Harness Non-Pull Dog HarnessElastic webbing and mesh cover the dog39s chest giving the Dog free movement and not restrictingAdjustable shoulder straps and sliding security lock ensure a simple fitAvailable in three sizes Small Medium amp LargeSizes ApproxSmall -Neck Circumference 20-30cmBreed Jack Russell Terrier Toy PoodleMedium -Neck Circumference 30 - 43cmBreed Retreiver Border CollieLarge -Neck Circumference 43 - 60cmBreed Great Dane Rottweilernbsp