Exhausted, covered in mud and desperately hungry, a team of Swedish athletes sat down for a meal as they prepared to take on a dangerous 20-mile trek through the Ecuadorian rainforest.
As they opened their canned meat, a tired Mikael Lindnord noticed a scruffy, miserable stray dog staring at him out of the corner of his eye.
Feeling sorry for him, he fed the dog a meatball and thought nothing of it, but as the team stood up to continue their race the animal started to follow them - and he didn't stop.
As the group of four navigated the final two stages of the 430-mile Adventure Racing World Championship, the dog befriended them and was eventually given the name Arthur.
Every grueling task the team face, Arthur would do the same. He swam alongside them while they kayaked down rivers, dragged himself up hills during hikes and pulled through knee-deep mud during treks.
Even when the team tried to get rid of their new member out of concerns for his safety - he refused to leave.
Read more at Daily Mail.