Cerberus is the guardian dog of the Underworld.
In The SeriesEdit
The only thing that could subdue him was Orpheus's lyre, although he is also fond of cake. He also has the power to make normal dogs more aggressive and grotesque in appearance than usual. He's friendly to those entering the Underworld and seems to be especially fond of Herry, but also very fierce against those who try to leave
He has three heads that are skull-like in appearance and a snake for a tail that can re-grow if severed.