Laelaps

Laelaps was a mythological dog in Greek mythology who never failed to catch his prey. It was a gift from Artemis to Procris, who gave it to her husband Cephalus. He decided to use the hound to hunt the Teumessian fox, a fox that was destined never to be caught. This was a paradox: a dog always to catch his prey and a fox never to be caught. Their useless chase went on until Zeus, troubled by their fates, turned both into stone and cast them into the stars as the constellations Canis Major (Laelaps) and Canis Minor (the fox).