This is adventure racing, widely hailed as the most dangerous sport in existence. Participants travel hundreds of miles across many different climates to a finish line far away. They bike, swim, row, run, and walk towards their destination. Most races take weeks at a time.
When the Swiss National Team entered the 2014 World Championship race, they had no clue they'd attract another member of the team on the way. This "member" was a dog. His name is Arthur. This is his story.