Vernon Jones (1912)
231. THE DOGS AND THE FOX
Some Dogs once found a lion's skin, and were worrying it with their teeth. Just then a Fox came by, and said, "You think yourselves very brave, no doubt; but if that were a live lion you'd find his claws a good deal sharper than your teeth."
Aesop's Fables: A New Translation by V.S. Vernon Jones with illustrations by Arthur Rackham (1912). This book is available online at Project Gutenberg.