Ralph

Ralph is a mail dog who works alongside Kodi in the movie Balto III: Wings of Change.

His story
He appears to be either an overweight or simply burly and muscular dog and therefore he is most likely an Alaskan Malamute. And more laid back of the trio, usually serving as the blunt of pranks yet voice of quiet reason and complaints. At the race, he has a weakness to the level of a claw, which often causes slowdowns.

Trivia

 * Dusty and Ralph were planned to be mates in the third movie, but writers didn't have time to put scenes in to explore this.