Many breeds of dog participate in skijoring. The only prerequisite is a desire to run down a trail and pull, which is innate in many dogs. Small dogs (less than 40 pounds) are rarely seen skijoring, because they do not greatly assist the skier; however, since the skier can provide as much power as is required to travel, any enthusiastic dog can participate. Athletic dogs such as pointers, setters and herding breeds take to skijoring with glee, as do most sled dog breeds; however, many other large, energetic dog breeds are utilized in this sport.