Kerberos

Personality
He is very playful, enjoying playing with a bone with Elspeth, Cleo and Flora.

Appearance
A very large (the size of a pick up truck) dalmatian with three heads.

History
Kerberos guards the gate in the Underworld.

Mentions
Elspeth, Cleo and Flora meet him in Episode Three, when they play a brief game with him with a bone.