The Yukon Quest is a 1,000-mile sled dog race starting this year in Fairbanks, Alaska and finishing in Whitehorse, Yukon Territory. 

Alaska Dispatch News
Impassable ice jams between the mouth of the Fortymile River and Dawson City necessitated a re-route to the Top of the World Highway for Yukon Quest mushers, resulting in an additional 2,500-foot climb.Marcel Vander Wier | Whitehorse Star
The defending champion left the Eagle checkpoint near dawn Tuesday, with the three closest chasers returning to the trail three to four hours later as the racers began a long stretch to Dawson in the Yukon Territory. Mike Campbell
The young musher from Eureka pulled out of Circle City first, heading towards the jumble ice of the Yukon River.  Sass, Allen Moore of Two Rivers and  Hugh Neff of Tok are leading the racers toward Whitehorse. Casey Grove | Fairbanks Daily News-Miner
Hugh Neff of Tok grabbed the early lead, with defending champion Brent Sass right behind him. Allen Moore of Two Rivers, the winner in 2013 and 2014, was running third. Alaska Dispatch News
The tandem of Kuskokwim 300 champion Pete Kaiser and Lucas Salzburn had just enough speed to hold off Iditarod veteran Nicholas Petit, who teamed with girlfriend Emily Maxwell.  Alaska Dispatch News
For the unusual Denali Doubles Sled Dog Race, 17 teams of two mushers and up to 20 dogs pulled up to a humble, makeshift starting line on Thursday before a tiny group of spectators in Cantwell.Tegan Hanlon
The winning team will pocket $5,000, with $2,000 going to the runner-up and $1,000 to third place.Alaska Dispatch News

The 33rd annual Yukon Quest 1,000 Mile International Sled Dog Race begins Saturday in Fairbanks. Twenty-three mushers will race to Whitehorse, Yukon. 

Alaska Dispatch News
Each of the 20 teams in this unique Alaska race links two mushers, typically two sleds and 12 to 20 dogs. While dogs may be dropped outbound at either of the two checkpoints, they must rejoin the team in-bound and finish.Mike Campbell