Balto ( c. 1919 – March 14, 1933) was a Siberian Husky and sled dog belonging to musher and breeder Leonhard Seppala . [1] He achieved fame when he was part of a team of sled dogs driven by Gunnar Kaasen on the final leg of the 1925 serum run to Nome , in which diphtheria antitoxin was transported f...