Underdog is a Fallout: Equestria side-story, written by Mighty Thantos. The story is told from the viewpoint of a Hellhound outcast, Underdog.
Underdog, a Hellhound rejected by his pack and left to die, was rescued by a pony, but was forced to become a wasteland wanderer due to the prejudice of ponies. He sets off into the unknown, searching for a place to call his home.
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