There are three types of sled dog races: sprint, mid-distance, and long-distance.
Sprint races typically last two or three days with heats run on successive days. They are often over relatively short distances of 4 to 100 miles.
Mid-distance races cover a range of distances from 100 to 300 miles. They usually have a series of shorter races leading up to a more complex event with more than one major race leg.
Long-distance races cover distances of 300 to over 1,000 miles. These events are almost always multi-day affairs with several stages covering different terrain.