Iditarod Sled Dog Race
Official Web site for the Iditarod, an annual two week dog sled race in Alaska, where mushers and sled dogs cover more than 1000 miles. See also the Wikipedia Iditarod article.

Yukon Quest Sled Dog Race
A 1000 mile dog sled race that takes place every year, and runs from Whitehorse in the Yukon Territories of Canada to Fairbanks, Alaska.

Crossing the Andes with Sled Dogs
Crossing from Chile to Argentina August 20-28, 2009.