Aliy Zirkle handles her dogs during a rest in Galena along the Yukon River, her last stop before heading towards Nulato. Late in the night, as she approached Nulato, Zirkle was attacked by a snowmobiler a few miles outside the small community. Zachariah Hughes/Alaska Public Media hide caption

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Zachariah Hughes/Alaska Public Media

Aliy Zirkle drives her dog team during the 2014 Iditarod. Emily Schwing/NPR hide caption

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Emily Schwing/NPR

Iditarod's Top Dogs Will Brave New Twists

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Several female mushers in the Iditarod Trail Sled Dog Race are trying out new attire that allows them to skip bathroom stops. Here, a musher and his team pass fans at the ceremonial start of the race in Anchorage. Dan Joling/AP hide caption

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Dan Joling/AP

Dallas Seavey holds his leaders, Diesel, left, and Guiness, after he arrived at the finish line to claim victory in the Iditarod Trail Sled Dog Race in Nome, Alaska, on Tuesday, March 13, 2012. Marc Lester/Anchorage Daily News/Landov hide caption

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Marc Lester/Anchorage Daily News/Landov