Wolf on his rambles came to a field of oats, but, not being able to eat them, he was passing on his way when a Horse came along.
      
      "Look," said the Wolf, "here's a fine field of oats. For your sake I have left it untouched, and I shall greatly enjoy the sound of your teeth munching the ripe grain."
      
      But the Horse replied, "If wolves could eat oats, my fine friend, you would hardly have indulged your ears at the cost of your belly."

http://kids.christiansunite.com/Aesops_Fables/The_Wolf_And_The_Horse.shtml