In Greek mythology, Laelaps was a legendary dog who never failed to catch what he was hunting. He was a gift from Zeus to Europa.
The hound was passed down to King Minas . Minas fell ill and called Prokris of Athens to his aid. When she cured him he gave her Laelaps and a javelin that never missed its target. Prokris's husband decided to use the hound to hunt the Fox of Teumessos , a fox that could never be caught. This was a paradox, a dog who always caught his prey and a fox that could never be caught. The chase went on for quite a while until Zeus turned both to stone, perplexed by their contradictary fates.
