Why is the pig mad at the dog, the dog at the cat, the cat at the mouse?
Once upon a time the pig got a letter. He was very careful with it and took it everywhere with him. But once he had to go somewhere where he couldn't bring the letter. What should he do with it? Where could he put it? After thinking about it he came to the only solution, he entrusted the letter to the dog. The dog guarded the letter with care for a long time, but once he had work to do and he couldn't bring the letter with him. What to do with the letter? He had only one friend so he entrusted the letter to the cat. The cat took care of it for a while but then he got bored and wanted to go out and have a little chat.
He thought about where to put it. He didn't have anyone to entrust it to so he took the letter to the attic and hid it there.
At night, he went home and searched for the letter but he couldn't find it. All the mice ate it! When the dog got home the cat couldn't explain it, just like the dog couldn't explain it for the pig.
From then neither the pig nor the dog, neither the dog nor the cat, neither the cat nor the mouse looked at each other the same way.