
Several distinct dog breeds are in common use as sled dogs, although any sized breed may be used to pull a sled. Purebred sled dog breeds range from the well-known Siberian Husky[3] and Alaskan Malamute[3] to rarer breeds such as the Mackenzie River Husky[3] or the Canadian Eskimo Dog (Canadian Inuit Dog). Dog drivers, however, have a long history of using other breeds or crossbreeds as sled dogs. In the days of the Gold Rush in Yukon, mongrel teams were the rule, but there were also teams of Foxhounds and Staghounds. Today the unregistered hybridised Alaskan Husky[3] is preferred for dogsled racing, along with a variety of crossbreeds, the German Shorthaired Pointer often being chosen as the basis for cross breeding. From 1988 through 1991, a team of Standard Poodles competed in the Iditarod Trail Sled Dog Race.
Sled dogs are expected to demonstrate two major qualities in their work (apart from basic physical capability to pull the sled). Endurance is needed to travel the distances demanded in dogsled travel, which may be anything from 5 to 80 mi (8 to 129 km) or more a day. Speed is needed to travel the distance in a reasonable length of time. Over longer distances, average traveling speed declines to 10 to 14 mph (16 to 23 km/h). In poor trail conditions, sled dogs can still usually average 6 or 7 mph (9.7 or 11 km/h). Sled dogs have been known to travel over 90 mi (145 km) in a 24 hour period while pulling 85 lb (39 kg) each.
Sled dogs pull various sorts of sleds, from the small 25 lb (11 kg) sprint-racing sleds, through the larger plastic-bottomed distance racing toboggan sleds, to traditional ash, freighting sleds and the trapper's high-fronted narrow toboggan. Sled dogs are also used to pull skiers, kick sleds and to draw wheeled rigs when there is no snow. They have even been used to pull kick scooters in places where there is a lack of snow, a sport known as dog scootering. Modern teams are usually hitched in tandem, with harnessed pairs of sled dogs pulling on tug lines attached to a central gang line. Trappers in deep snow conditions using the toboggan will hitch their dogs in single file with traces on either side of the line of dogs. Dog teams of some Inuit are run in "fan hitch", each dog having its own tow line tied directly to the sled.