Why is the pig angry with the dog, the dog with the cat, the cat with the mouse?
The pig once received some dog-skin writing, a letter of freedom. He guarded it like the light of his eye, carried it with him day and night; but one day he had to go on a long journey, he couldn't take the letter of freedom with him. He wondered what to do with it, and at last he decided to give it to his best friend, the dog, who would keep it for him while he was away. And the dog did.