The Dog in the Manger

by Aesop

A DOG lay in a manger, and by his growling and snapping prevented the oxen from eating the hay which had been placed for them. What a selfish Dog! said one of them to his companions; He cannot eat the hay himself, and yet refuses to allow those to eat who can.

Moral:
We should not deprive others of blessings because we cannot enjoy them ourselves.