"The Last Dog" is a short story by M. J. McGrath that explores themes of isolation and survival in a post-apocalyptic world. The narrative follows a young boy named Brock who lives in a dome, the last remnant of civilization, where humans have abandoned the outside world due to environmental collapse. Brock discovers a dog outside the dome, which symbolizes hope and companionship. As he forms a bond with the animal, he grapples with the decision to bring it back to the dome or leave it in the wild. The story highlights the importance of connection and the struggle for survival in a desolate environment.