Mad Cow Scare Disrupts Sled Dog Race

A Canadian ban on U.S. beef imports following the first case of U.S. mad cow disease results in headaches for mushers competing in Alaska's Iditarod sled dog race. Americans competing in the race must transport their animals' food through Canada. They say a change in their dogs' diet so close to the race could be disastrous. Hear NPR's Bob Edwards.

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