The cat and the fox were traveling together, sharing philosophical thoughts about beauty, truth, the nature of existence, good and evil, and so on.
Along the way they saw a wolf eating a sheep.
"How immoral!" said the cat.
"I concur!" said the fox. "It's most unethical!"
Then they passed a barnyard where they saw a hen and her chicks. The fox seized the hen and devoured her, while the cat devoured the chicks.
Having satisfied their hunger, they continued on their journey, philosophizing as before.
Many who condemn criminal behavior will behave like criminals themselves, given the right opportunity.
Inspired by: Mille Fabulae et Una, a collection of Latin fables that I've edited, free to read online. I am not translating the Latin here; instead, I am just telling a 100-word version of the fable.
Notes: This is fable 392 in the book, which is not in Perry; the fable is from Desbillons, who cites La Motte as his source. This is an illustration for a different cat-and-fox fable: