A miller dies, and all he leaves his youngest son is a cat—but a very smart cat. Puss has a plan to transfer the property of an odious ogre to his master. He lays the trap carefully, then tricks the ogre into showing off his power to change size and shape. Can the ogre turn into a fierce lion? Yes, and he does. But can the ogre turn himself into something small—a tiny mouse? More vain than cautious, the ogre takes the bait, and down into Puss's stomach he goes.
Perrault's "moralité" at the end of the tale (I did not make this up): "There is a great advantage in receiving a large inheritance, but hard work and ingenuity are worth more than wealth acquired from others."