Togo was the lead sled dog of musher Leonhard Seppala and his dog sled team in the 1925 serum run to Nome across central and northern Alaska. Despite covering a far greater distance than any other lead dogs on the run, over some of the most dangerous parts of the trail, his role was left out of contemporary news of the event at the time, in favor of the lead dog for the last leg of the relay, Balto, whom Seppala also owned and had bred.

A sled dog is a dog trained and used to pull a land vehicle in harness, most commonly a sled over snow.