The Adventure Racing World Series might be the most fraught and challenging sports event in the world. It usually involves teams of four navigating through a vast wilderness terrain while utilizing adventure skills from a range of disciplines including trekking, adventure running, mountain biking, paddling and climbing.

During the 2014 competition, for the first time ever, an exception was made so that one team could finish the race with five members instead of four. That fifth member? A stray dog, named Arthur by his adopted companions, who decided to follow one team for 430 harrowing miles through the Amazon jungle, according to the Daily Mail. If this story doesn’t warm your heart, you don’t have one.

Team Peak Performance, hailing from Sweden, happened upon Arthur while sharing a meal in advance of a 20-mile race stage through rough terrain in Ecuador. Mikael Lindnord, one of the team’s members, felt sorry for the scruffy, lonely stray, and decided to share a meatball with him. It was an innocent gesture — Lindnord had no intention but to lift the poor pouch’s spirits — but it was a gesture that would earn him a friend for life.

As the team got up to continue their race, Arthur tagged along. The team suspected he would eventually turn back around, but Arthur kept following them. He trailed them through muddy jungle, across vast distances of the Amazon river, all the way to the finish line.

Interesting Read…