Cerberus

Cerberus is a summoned monster from YGGDRASIL.

Appearance
A giant dog whose long tail reminded one of a dragon. It had three heads, and its three pairs of fiery eyes

Trivia

 * In the Web Novel, Ainz Ooal Gown uses this creature to devour the delegation from the Re-Estize Kingdom after he found their attitude towards his abide insolent.