This one confuses me slightly, why aren't any of Balto's pups (aside from Aleu and Kodi) shown in the two sequels? I know they were adopted but so was Kodi (as shown in Wolf Quest) and he's the only other pup to have a reappearence. Not only that, but it was apparent that the puppies' new owners were local to Nome (Jenna even mentions the boy who adopted Dingo was a friend of Rosie's). It's as though the film directors forgot Balto had four other pups. Shouldn't they have at least made a cameo appearence (maybe as teens, like Kodi and Aleu)?
They did reappear somewhat. Look here http://www.youtube.com/watch?v=ZLnA3JlEcG8
(I know, the quality isn┤t that good but it was the first video that appeared.)
Pay attention to the "flashbacks" or memories and you┤ll see that the creators didn┤t forget the other pups, they just don┤t have any other appearence in the movie.