Skijoring with a dog is a sport in which a dog (or dogs) assist a cross-country skier. One to three dogs are commonly used. The cross-country skier provides power with skis and poles, and the dog adds additional power by running and pulling. The skier wears a skijoring harness, the dog wears a sled dog harness, and the two are connected by a length of rope. There are no reins or other signaling devices to control the dog; the dog must be motivated by its own desire to run, and respond to the owner’s voice for direction. – Wiki.