One day a dog jumped into the manger full of hay, down to sleep in it. Suddenly an ox came up and wanted to eat the hay.
As soon as the dog had heard him, it sprang up and barked furiously. The ox tried to get at the hay again, but the dog threatened to bite him if he came near. The ox then said, "Why will you not let me eat my hay? It is no use to you, for you cannot eat it yourself."
That doesn't matter", snarled the dog. "If I can't eat it myself, nobody else will have it.