The Chase - Pursuit Without Fatigue Canis Major depicts Laelaps, a mythological dog who never failed to catch what he was hunting. Gifted to Europa by Zeus, Laelaps the dog was once used to hunt the Teumessian fox, a fox that could never be caught. Laelaps was known for his speed, loyalty, and his persistence during the chase. Zeus cast both the dog and the fox into the heavens, where the chase continues to this day.