Ruffwear - Omnijore Dog-Pulling Gear MADE FOR ADVENTURE: The Omnijore Harness is designed for any dog-powered activity, such as skijoring, mountainboard-joring, skatejoring, bikejoring, and canicross. Enjoy joring with your pup all year long! JORING SYSTEM: The complete Omnijore System requires this harness in addition to the towline and human hipbelt (sold separately). The components work together to maximize performance, comfort, and fun. DESIGNED FOR DOGS: The pulling-specific design comes in three sizes and features four points of adjustability for a comfortable, customized fit. GREAT FOR TRAINING: The Omnijore Harness features a girth strap that aids in training and can be removed when your dog is accustomed to joring. THE RIGHT FIT: Measure around the widest part of your dog's rib cage and select the corresponding size.