The team says they tried to send the dog away at first, fearing that he was too frail to handle the difficult course, but he refused to leave their side. Over the next 20 miles, Arthur stayed close by, trudging through mud and thick foliage as the team made their way through the Amazon rainforest.
By the time they neared the final stretch, during which they would have to kayak upstream, the team's furry tagalong had caught the attention of race officials who, like them, had concerns about the dog's safety.
"The organization gave the advice not to bring dog Arthur out on the last leg - a dog in the kayak didn't seem like a great idea - and the team was going to follow this advice. [The team] put their kayaks down in the water and set off, but Arthur refused to be left and started swimming," the group writes.
Seeing the tough but tired dog trying to keep up, Lindnord offered him a place aboard the boat:
"It was quite difficult, technically, to paddle with a big dog in your lap. Sometimes he jumped in to hunt fish. When he became too cold, he had to borrow my jacket."