The Teumessian Fox was a terrible creature that was ravaging the countryside of Thebes. She devoured people and livestock, destroyed crops, and couldn't be stopped because she was destined to never be caught.
Remember yesterday's beast, Laelaps, the hound that always caught its prey?
Well, they sicced him on this monster.
So, a never ending chase ensued, and Zeus, who hated conundrums like this,
turned both creatures into stone and threw them to the heavens, where some say they became Canis Major,(Laelaps), and Canis Minor,( the Fox).