Cerberus
... that in classical mythology, Cerberus is a monstrous dog with multiple heads that guards the gates to the underworld?
... that in <a href="./Classical_mythology" id="mwhw" rel="mw:WikiLink" title="Classical mythology">classical mythology</a>, <b id="mwiA"><a href="./Cerberus" id="mwiQ" rel="mw:WikiLink" title="Cerberus">Cerberus</a></b> <i id="mwig">(pictured)</i> is a monstrous dog with multiple heads that guards the gates to the <a href="./Underworld" id="mwiw" rel="mw:WikiLink" title="Underworld">underworld</a>?