Mabel was a three-legged dog belonging to the fetcher Oliver Birch. She was a Golden Retriever, and was missing one of her hind legs. Birch found Mabel from the abandoned colony ship CAA Butterworth on a fetching run in the debris field over the planet Dwarka and took her as a pet. Upon discovery, the animal was nervous and hungry, but curiously, the only thing alive on the ship.
- Halo: First Strike (First appearance)