(also sledge dogs and sleigh dogs) are a group of dog breeds and mongrels that, historically, were bred for the purpose of pulling a dog sled. These dog sleds were important for transportation in arctic areas, hauling supplies in areas that were inaccessible by other methods. They were used with varying success in the explorations of both poles, as well as during the Alaskan gold rush. Until snowmobiles became reliable, sled dog teams delivered mail to rural communities in Alaska and northern Canada.
Sled dogs today are still used by some rural communities, especially in areas of Alaska and Canada and throughout Greenland. They are also used for recreational purposes, and are raced in events known as dog sled races such as the Iditarod and the Yukon Quest. Numerous sled dog breeds are also kept as pets or raised as show dogs.