Long-distance sled dog racing including the Iditarod involves extreme exertion, cold exposure, and high mortality rates that raise fundamental welfare questions about the sport despite the dogs apparent enthusiasm for running.
Sled dog welfare involves genuine complexity: these are animals bred and trained for high-intensity endurance running who display behavioral motivation for the activity. But behavioral motivation does not preclude welfare costs at extremes — a dog that wants to run may still experience suffering from overexertion, cold injury, or disease during a multi-day endurance race. The mortality rates associated with long-distance racing create a welfare threshold that behavioral enthusiasm does not override.