User: Which dog is the hero of the 1925 serum rum to Nome, Alaska?
Assistant: While Balto is the most popular and well-known dog of the serum run, also called the Great Race of Mercy, it was actually another dog named Togo whose team covered the most miles on the dangerous trail. Balto was the lead dog of Gunnar Kaasen's dog sled team, who covered the last 55 miles of the race relay. Togo, the lead dog of Leonhard Seppala's team, covered the previous 261 miles of their relay segment which was in much harsher and dangerous territory. Balto has received much more attention and glory for his participation.