Cinnamon Bun's Dog is a fake dog from the episode, "Earth & Water." He was mentioned at first to Flame Princess when Cinnamon Bun asked her if she wanted to come over and let his dog while she was being experimented on. When they got there, it turned out to be fake. We last saw him near the end of the episode next to a bowl of food with a note that asked that he be fed.
According to Cinnamon Bun, he's a fake dog made out of a mop and a rock.
- Cinnamon Bun was happy to have switched to a "Real Dog" after he arrived at the Fire Kingdom, and thus refused to leave.