Cerberus

Cerberus is one of the offspring of Typhoeus and Echidna. It is a three headed dog with a snake tail and snake heads proturding from his back. He guards the entrance to the underworld, allowing the dead to enter but, never to leave. One of the few living mortals to get past Cerberus was Orpheus who charmed it to sleep with his song during his attempt to rescue Eurydice from death. Fetching Cerberus from the underworld and displaying him to King Eurystheus was the last labor of Herakles .