The Dog in the Manger
Once when some oxen went to their manger to eat hay they found a small dog in it. The dog growled and snapped at the oxen and would not let them come near the hay. The stableman saw it all. “Get out of there, you selfish cur!” he cried to the dog. “You cannot eat the hay yourself and you will not let those who can.” He seized a whip and the dog was glad to run yelping away.
—From Æsop