What does the Serum Run have to do with the Iditarod?

I've just added a link at the top right to a fun game called, "Serum Run." Lots of people think the Iditarod was started to remember the famous Serum Run back in 1925, but that isn't really true. Joe Redington Sr. started the race to make sure people kept using sled dogs. If you play the game, you will find out how important sled dogs were in saving the sick people of Nome. I think this true story is important in Alaska history and helps us appreciate what heroes dogs can be. Do you know any stories of dogs that are heroes? What dog was it and what did it do?
Mrs. A.