Gentle Leader Harness Small/Medium Colour: Black 4 adjustment points for maximum comfort & reliable fit Discourages your dog from pulling on the leash This is a Gentle Leader Small/Medium Black Easy Walk Dog Harness (Beau Pets). The Gentle Leader Harness is designed to gently discourage your dog from pulling while walking on a lead. It's so simple - easy to fit, and easy to use. There is very little acclimation time or special technique required. Unlike traditional collars, The Gentle Leader Harness never causes coughing, gagging or choking because the chest strap rests low across the breastbone, not on the delicate tracheal area. Traditional harnesses actually encourage dogs to pull harder because of the "opposition reflex". That's the reflex that causes sled dogs to pull against pressure and do what they do. The Gentle Leader Harness' unique front-chest lead attachment stops pulling by steering your dog to the side and redirecting his attention towards you. Its martingale loop provides extra leverage for easy, relaxed control and prevents harness twisting and gaping.