Petite/Small, 1/2" wide, 14-18" girth Click here to see available colors The Girth should be measured snugly around the dog's rib cage, just behind the front legs. More information and use instructions in an Adobe pdf file (660K). This harness is designed to gently discourage your dog from pulling while walking on a leash. This means more of you walking your dog and less of your dog walking you. Unlike traditional collars, the Gentle Leader® Easy Walk™ Harness never causes coughing, gagging, or choking because the chest strap rests low across the breastbone, not on the delicate tracheal area. The strong nylon is both soft and adjustable in four places for maximum fit and comfort. There is a quick snap buckle on both the shoulder and belly straps, plus a complementary color for the belly strap, making the harness easy to put on and take off. It's easy to fit and easy to use, that's why they call it Easy Walk! Lifetime Guarantee: if your Premier Gentle Leader has any sort of accidental damage or hardware failure, including chewage, you can exchange it for a new harness. This guarantee does not include harnesses that are simply dirty, outgrown or lost. If you purchased it from us, just return the damaged item to us and enclose payment of $5.95 for return shipping. For dogs with additional training issues like jumping, barking, excessive pulling and lunging, we recommend the Gentle Leader Headcollar. Do not use the Gentle Leader Easy Walk Harness with a retractable leash. With a retractable leash, the dog is “rewarded” with more leash and less resistance when he pulls ahead. You want the dog to learn to NOT pull ahead. In addition, a retractable leash will always apply a slight constant pressure, teaching your dog it is okay to continue pulling.