Skijoring is a winter sport where a person on skis is pulled by a dog. The skier wears a skijoring belt around waist with quick release hitches and sometimes leg loops, to keep position. The dog wears a sled dog harness, connected by a bungee line of 8 feet, a bit longer if there are three dogs. There are no reins or other signaling devices and the dog is motivated and controlled by the voice of the skier.
Here you can find some Neewa products for skijoring.