A long time ago, the Dog and the Cat were close friends. They were fed delicious food by their owner. Therefore, one day, the Dog came up with an idea:

- Let's contribute food and eat together, Cat! If we share, when it's our birthdays, we can invite both the Cat and Dog neighbors to eat with us. It will be so much fun!

The Cat thought for a moment and replied, "That sounds good. Let's contribute food together."

From then on, whenever it was mealtime, the Dog would bring food to the Cat's house and hide it behind the cupboard.

One day, the Dog heard a strange noise behind the cupboard and rushed to see. It found the Cat eating all the food they had contributed. The Dog became very angry and upset. Since then, they would always argue over each other's share of food, with neither of them willing to give in. They even fought with each other. That's why people have a saying: "Fight like cats and dogs."