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In page Iditarod Trail Sled Dog Race:

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The dogs are well-conditioned athletes. Training starts in late summer or early fall and intensifies between November and March; competitive teams run 2,000 miles (3,200 km) before the race. When there is no snow, dog drivers train using wheeled carts or all-terrain vehicles set in neutral.[citation needed] An Alaskan husky in the Iditarod will burn about 9,666 calories each day; on a body-weight basis this rate of caloric burn is approximately twice that of a human Tour de France cyclist.[5] Similarly the VO2 max (aerobic capacity) of a typical Iditarod dog is about 240 milligrams of oxygen per kilogram of body weight, which is about three times that of a human Olympic marathon runner.[6]