The Dog in the Manger
The Cattle looked at the Dog in disgust. "How selfish he is!" said one. "He cannot eat the hay and yet he will not let us eat it who are so hungry for it!"
Now the farmer came in. When he saw how the Dog was acting, he seized a stick and drove him out of the stable with many a blow for his selfish behavior.
Do not grudge others what you cannot enjoy yourself.