Iditarod Trail Sled Dog Race early in the 20th century. The main route of the Iditarod trail extends from Seward in the south to Nome in the northwest, and was first surveyed by Walter Goodwin in 1908, and then cleared and marked by the Alaska Road Commission in 1911 and 1912. The entire network of branching paths covers a total of . Except for the start in Anchorage, the modern race follows parts of the historic trail. The trail is composed of two routes: a northern route, which is run on even-numbered years, and a southern route, which is run on odd-numbered years. Both follow
Sled dog racing weight per dog is carried in the sled. This type of race only has about 1 to 5 dogs pulling the sled or scooter at one time. The American Dog Derby is the oldest dogsled race in the United States and was the first dogsled race that rose to international prominence. Begun in 1917 and heavily promoted by Union Pacific Railroad, it was on par with the Kentucky Derby and with the Indianapolis 500 in terms of interest and press coverage in the early part of the 20th century and was considered to be the world championship dogsled race. American