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Sled dogs, known also as sleigh dogs, sledge dogs or sleddogs are a group of dogs that are used to pull a wheel-less vehicle on runners (a sled or sleigh) over snow or ice, by means of harnesses and lines. The origins of this arrangement are unknown.

A ten-dog team of Seppala Siberian Sleddogs in tandem hitch on a frozen Yukon lake (Photo by Isa Boucher)

Several distinct dog breeds are in common use as sleddogs, although any medium-sized breed may be used to pull a sled. Purebred sleddog breeds range from the well-known Siberian Husky and Alaskan Malamute to rarer breeds such as the Mackenzie River Husky. Dog drivers, however, have a long history of using other breeds or crossbreds as sleddogs. In the days of the Gold Rush in The Yukon, mongrel teams were the rule, but there were also teams of Foxhounds and Staghounds. Today the unregistered hybridised Alaskan husky is preferred for dogsled racing, along with a variety of crossbreds, the German Shorthaired Pointer often being chosen as the basis for crossbreeding. From 1988 through 1991, a team of Standard Poodles competed in the Iditarod Trail Sled Dog Race

Sleddogs 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 five to eighty miles (8 to 130 km) or more a day. Speed is needed to travel the distance in a reasonable length of time. Racing sleddogs will travel up to an average twenty miles per hour (32.2 km/h) over distances up to 25 miles (40 km). Over longer distances, average travelling speed declines to 10 to 14 miles per hour (16 to 22 km/h). In poor trail conditions, sleddogs can still usually average 6 or 7 miles per hour (10 or 11 km/h). Sled dogs have been known to travel over 90 miles in a 24 hour period while pulling 85 pounds each.

Royal Canadian Mounted Police (R.C.M.P.) hitching sled dogs into their harness

Sleddogs pull various sorts of sleds, from the small 25 pound (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. Sleddogs are also used to pull skiers and to draw wheeled rigs when there is no snow. A team of sleddogs may consist of anywhere from three to two dozen animals. Modern teams are usually hitched in tandem, with harnessed pairs of sleddogs pulling on tuglines attached to a central gangline. 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 Arctic natives are run in "fan hitch", each dog having its own tow line tied directly to the sled.

Driving sleddogs has become a popular winter recreation and sport in North America and Europe; sleddogs are now found even in such unlikely places as Australia and Patagonia.

A typical sled dog breed, such as the Greenland Dog, has a very dense double coat, wide padded feet, erect ears, a curled tail, and a muscular build.

• Alaskan husky
• Alaskan Malamute
• Canadian Eskimo Dog (or Qimmiq)
• Chinook
• Eurohound
• Greenland Dog
• Mackenzie River Husky
• Sakhalin Husky
• Samoyed
• Seppala Siberian Sleddog
• Siberian Husky (or Arctic Husky)

Indian Dog sled near Fort Clark. Watercolor by Maximilian zu Wied-Neuwied 1833.

• Dogsled racing
• Dog sled
• Mushing
• Leonhard Seppala
• Balto
• Togo (dog)