Hade's watchdog, 8 letters
Mythical dog guard of Hade's door, 8 letters
Subject of Hercules' Twelfth Labor, 8 letters
Three-headed watchdog of myth, 8 letters
(Greek mythology) 3-headed dog guarding the entrance to Hades, 8 letters
Son of Typhon, 8 letters
Design of alternating squares, 8 letters