I think a dog could also chase away rats, though I have no personal experience with that; however, I do have personal experience with cats. A cat simply will not tolerate a rat under any circumstances, and the rat itself flees upon seeing one. If it doesn't run away, the cat catches and eats it, thereby helping to keep the area clean.

In this way, we get real benefits from this pet. Many people look down on it, but if we look at its benefits, there are many.