Poseidon's pet. He didn't buy her from a pet shop. She was hutched in the wild. While she was
only a few weeks old, her mother was killed by a Poseidon;s monster
and she was almost eaten by a scavenger (see comics). That's when Poseidon found her and
saved her. Owning pets from the wild is illegal, so Poseidon had Billy make fake papers for him.