Of the most common sled dogs, what type would Balto have been?
There are many differant dogs which can be used for pulling sleds, but the most common for long races are the Siberian Husky, Alaskan Malamute, and Alaskan Huksy.
Of the three, Balto would PROBABLY fall into the Alaskan Husky catagory. Alaskan huskies are mutts that are a mixture of high stamina dogs and dogs that can easily indure cold weather, and most have some wolf in them. They are the most common dog used in the Iditarod.
Next most popular is the Siberian Husky. Steele wuold most likely fall into this catagory, though it's hard to tell whether he's a malamute or a husky. (Forgive me if it says in the movie, I haven't seen it in years) Though they are slightly bigger than the Alaskan Husky, they are, for whatever reason, not as popular among the big racers, such as Martic Buser or Lance Mackey.
Last but certainly not least if the Malamute, whether it be Alaskan, Mackenzie Valley, or whatever. They are the largest of the three, and also the stockiest. For whatever reason, mushers don't use these very often. They are more commonly used for weight pulling.