The HALTI Harness is designed to stop dog's pulling and to give maximum control. Size:Small -  Chest 30-60cm eg, Jack Russell/Corgi/TerrierMedium - Chest 60-80cm eg, Labrador / Border CollieLarge - Chest 80cm+ eg, G.Dane / Mastiff / RottweillerStops pulling by providing steering control from the chest.  Ideal for medium to large dogsFront Control: Stops pulling by controlling the dog from the chest and shouldersDual Steering: Back and chest rings provide dual steering control points for use with the Halti training leadStrong and Secure: High quality nylon webbing for strength and durabilitySafety Clip: Safety clip connects to the dog’s collar for extra security.Use with a Halti training lead for optimum steering and control