Laelaps was one of these 
Laelaps was one of these animals who always caught her prey; she was given to Europa by a love-struck Zeus. After spying on Artemis bathing, Actaeon was eaten by these animals, which he used for hunting. Upon Odysseus' return to Ithaca, (*) Argos, an animal of this type, dropped his ears and wagged his tail when he saw his master. The guard of Hades, Cerberus, is a three-headed one of, for 10 points, what kind of domestic animal?
Laelaps was one of these animals who always caught her prey; she was given to Europa by a love-struck Zeus.
dogs