Jim Lanier of Chugiak, Alaska, drives his team through the blowing snow on the Yukon River outside Ruby, Alaska, on Saturday, March 11, 2006, during the Iditarod Trail Sled Dog Race.

Sixty-seven year-old musher Jim Lanier, drives his team up the Iditarod Trail Sled Dog Race trail between Unalakleet and Shaktoolik, Alaska, on Monday, March 10, 2008.

Iditarod musher Don Honea feeds his dog team at Skwenta, 125 miles into the 1,135 mile race from Anchorage to Nome, Alaska, on March 7, 1984.

The northern lights are seen from Ruby, Alaska, on March 8, 2012. Mitch Seavey is the first musher in the Iditarod Trail Sled Dog Race to reach the village of Ruby on Friday, March 9, 2012, 480 miles from the finish line at Nome.

Iditarod front-runner Dallas Seavey makes his final drive toward Nome, Alaska, during the Iditarod Trail Sled Dog Race on March 13, 2012.

Dallas Seavey pulls in to the checkpoint in Unalakleet, Alaska, during the Iditarod Trail Sled Dog Race on March 11, 2012.

Wolvie and Roscoe stir as Karen Ramstead prepares to feed them in Nikolai, Alaska, during the Iditarod Trail Sled Dog Race on March 7, 2012.

Celeste Davis moves through the Takotna, Alaska, checkpoint on March 12, 2010, during the Iditarod Trail Sled Dog Race.

Iditarod musher Peter Kaiser, from Bethel, Alaska, races from Safety to the Nome, Alaska, finish line of the 2011 Iditarod Trail Sled Dog Race, March 15, 2011.

Two of Iditarod Trail Sled Dog Race rookie Lori Townsand's dogs play as they wait their turn for the pre-race checkup Feb. 28, 1996, at the Iditarod headquarters in Wasilla, Alaska.

Two mushers cross the Farewell Burn during the Iditarod Trail Sled Dog Race on March 6, 2012, in Nikolai, Alaska.

The aurora borealis, or northern lights, fill the sky above the Takotna, Alaska, checkpoint during the Iditarod Trail Sled Dog Race on Wednesday, March 9, 2011.

Aliy Zirkle crosses ice on the way to the finish line in Nome, Alaska, during the Iditarod Trail Sled Dog Race on March 13, 2012.

Last yearís winner and veteran dog musher Susan Butcher pulls into this checkpoint in the heat of the day in McGrath, Alaska, on March 12, 1987.

One of Tim Osmar's sled dogs looks out of its pen before the start of the Iditarod Trail Sled Dog Race in Willow, Alaska, Sunday, March 2, 2008. A record field of 96 mushers are running the 1,100 mile sled dog race to Nome.

Bruce Johnson of Atlin, B.C., Canada, takes a nap in the heat of the day at Nikolai checkpoint along the Iditarod trail in Alaska, March 12, 1987.

Iditarod musher Hans Gatt from Whitehorse, Yukon Territory, washes out his dog food trays next to the hot water barrel at the Takotna checkpoint during the 2011 Iditarod Trail Sled Dog Race on March 9, 2011.

Rick Swenson leads his team the final few yards at the conclusion of the ninth annual Iditarod Sled Dog Race in Nome, Alaska, March 19, 1981. The Eureka musher won the race for the third time, covering the 969 miles from Settlers Bay, near Anchorage, to Nome in 12 days, 8 hours, 45 minutes and 2 seconds.

A musher drives his team along the Iditarod Trial Sled Dog Race through the trees on the Farewell burn area near Nikolai, Alaska Tuesday, March 8, 2005.

Aliy Zirkle feeds her dog team in Unalakleet, Alaska, during the Iditarod Trail Sled Dog Race on March 11, 2012.

Musher Bill Pinkham collects hot water during his stop in Takotna, Alaska, during the Iditarod Trail Sled Dog Race on Wednesday night, March 7, 2012.

Canadian musher Sebastian Schnuelle drives his team across Norton Bay, on March 16, 2009, near the Shaktoolik, Alaska, checkpoint on the Iditarod Trail Sled Dog Race.

Iditarod musher Michelle Phillips, from Tagish Yukon Territory, mushes into the Yukon River village of Anvik at sunset during the 2011 Iditarod Trail Sled Dog Race March 11, 2011.

Mac, one of Jeff Holt's sled dogs, peeks out of its box as he waits to join the team and begin the Iditarod Trail Sled Dog Race in Willow, Alaska, March 8, 2009.