Matt Failor drives his dog team, high in the Alaska Range during the Iditarod Trail Dog Sled Race in Rainy Pass, Alaska, U.S. March 8, 2021. Picture taken March 8, 2021. Zachariah Hughes/ADN/Pool via REUTERS 

Gunnar Johnson travels down the Susitna River during the start of the Iditarod Trail Sled Dog Race course drastically altered by the coronavirus pandemic at Deshka Landing in Willow, Alaska, U.S. March 7, 2021. Picture taken March 7, 2021. Bill Roth/ADN/Pool via REUTERS 

Ryne Olson sits with her seven-year-old dog Dolly, named after Dolly Parton from a litter theme of Country music stars, during the Iditarod Sled Dog Race at the Ophir checkpoint in Alaska, U.S. March 10, 2021. Picture taken March 10, 2021. Picture taken March 7, 2021. Zachariah Hughes/ADN/Pool via REUTERS 

Susannah Tuminelli's team runs at the beginning of the Iditarod dog sled race, which is being held in a closed loop through the wilderness due to the coronavirus disease (COVID-19) pandemic, in Willow, Alaska, U.S., March 7, 2021. Picture taken March 7, 2021. REUTERS/Nathaniel Wilder 

Mille Porsild and her dog team pass by Camp Flamingo on the Susitna River on the Iditarod Sled Dog Race course drastically altered by the coronavirus pandemic at Deshka Landing in Willow, Alaska, U.S. March 7, 2021. Bill Roth/ADN/Pool via REUTERS TPX IMAGES OF THE DAY 

Dallas Seavey leans over for a high-five at the Iditarod Sled Dog Race start area on a course drastically altered by the coronavirus pandemic at Deshka Landing in Willow, Alaska, U.S. March 7, 2021. Marc Lester/ADN/Pool via REUTERS 

Aaron Peck, of Grand Prairie, Alberta, waits for the race to begin at the Iditarod Sled Dog Race starting area on a course drastically altered by the coronavirus pandemic at Deshka Landing in Willow, Alaska, U.S. March 7, 2021. Marc Lester/ADN/Pool via REUTERS 

Larry Daugherty, a musher from Eagle River, holds empty packages of COVID-19 vaccine which he will carry with him on the Iditarod Sled Dog Race trail in a nod to the 1925 Serum Run, which relied on a relay of dog teams bringing diptheria vaccine to save a village from disease, at Deshka Landing in Willow, Alaska, U.S. March 7, 2021. Marc Lester/ADN/Pool via REUTERS 

Dennis Kananowicz, of Tolsona, leaves the Iditarod Sled Dog Race starting chute on a course drastically altered by the coronavirus pandemic at Deshka Landing in Willow, Alaska, U.S. March 7, 2021. Marc Lester/ADN/Pool via REUTERS 

Aliy Zirkle begins her final Iditarod dog sled race, which is being held in a closed loop through the wilderness due to the coronavirus disease (COVID-19) pandemic, in Willow, Alaska, U.S., March 7, 2021. Picture taken March 7, 2021. REUTERS/Nathaniel Wilder 

Matt Hall drives his dog team on the Susitna River on the Iditarod Sled Dog Race course drastically altered by the coronavirus pandemic at Deshka Landing in Willow, Alaska, U.S. March 7, 2021. Bill Roth/ADN/Pool via REUTERS TPX IMAGES OF THE DAY 

Ryne Olson drives her dog team past campfires on the Susitna River on the Iditarod Sled Dog Race course drastically altered by the coronavirus pandemic at Deshka Landing in Willow, Alaska, U.S. March 7, 2021. Bill Roth/ADN/Pool via REUTERS 

Wade Marrs' team runs at the beginning of the Iditarod dog sled race, which is being held in a closed loop through the wilderness due to the coronavirus disease (COVID-19) pandemic, in Willow, Alaska, U.S., March 7, 2021. Picture taken March 7, 2021. REUTERS/Nathaniel Wilder 

Wade Marrs looks up after rolling his sled at a sharp corner on the Susitna River during the Iditarod Sled Dog Race course drastically altered by the coronavirus pandemic at Deshka Landing in Willow, Alaska, U.S. March 7, 2021. Bill Roth/ADN/Pool via REUTERS 

Ryne Olson passes in front of spectators at the beginning of the Iditarod dog sled race, which is being held in a closed loop through the wilderness due to the coronavirus disease (COVID-19) pandemic, in Willow, Alaska, U.S., March 7, 2021. Picture taken March 7, 2021. REUTERS/Nathaniel Wilder 

Ryne Olson participates at the beginning of the Iditarod dog sled race, which is being held in a closed loop through the wilderness due to the coronavirus disease (COVID-19) pandemimc, in Willow, Alaska, U.S., March 7, 2021. Picture taken March 7, 2021. REUTERS/Nathaniel Wilder 

Dennis Kananowicz greets one of few spectators along the trail at the beginning of the Iditarod dog sled race, which is being held in a closed loop through the wilderness due to the coronavirus disease (COVID-19) pandemic, in Willow, Alaska, U.S., March 7, 2021. Picture taken March 7, 2021. REUTERS/Nathaniel Wilder 

Travis Beals' team runs at the beginning of the Iditarod dog sled race, which is being held in a closed loop through the wilderness due to the coronavirus disease (COVID-19) pandemic, in Willow, Alaska, U.S., March 7, 2021. Picture taken March 7, 2021. REUTERS/Nathaniel Wilder 

Aliy Zirkle, of Two Rivers, greets fans as she passes by the Iditarod Sled Dog Race starting area on a course drastically altered by the coronavirus pandemic at Deshka Landing in Willow, Alaska, U.S. March 7, 2021. Marc Lester/ADN/Pool via REUTERS 

Four-time Iditarod champion Dallas Seavey rounds a corner on the Susitna River on the Iditarod Sled Dog Race course drastically altered by the coronavirus pandemic at Deshka Landing in Willow, Alaska, U.S. March 7, 2021. Bill Roth/ADN/Pool via REUTERS 

Big Lake musher Martin Buser begins the Iditarod Sled Dog Race on a course drastically altered by the coronavirus pandemic at Deshka Landing in Willow, Alaska, U.S. March 7, 2021. Marc Lester/ADN/Pool via REUTERS 

Christopher Parker, a rookie from Fairbanks, leaves the Iditarod Sled Dog Race starting line on a course drastically altered by the coronavirus pandemic at Deshka Landing in Willow, Alaska, U.S. March 7, 2021. Marc Lester/ADN/Pool via REUTERS 

Leaders for Wade Marrs run toward the Susitna River during the Iditarod Sled Dog Race on a course drastically altered by the coronavirus pandemic at Deshka Landing in Willow, Alaska, U.S. March 7, 2021. Marc Lester/ADN/Pool via REUTERS