Cats cannot see "dirty" things. There are rumors that cats can see because their vision, hearing, and smell are different from ordinary people. Cats will be frightened when they see something they are afraid of at night, and they will howl and make their hair stand on end.

Cats cannot see "unclean" things. People often say that cats cannot see unclean things. The reasons may be as follows:

1. Staring: Sometimes they will stare One thing people don't notice is that it looks like they are staring at an object in the sky.

2. Pupil dilation: When a cat suddenly turns to darkness from a bright environment, its pupils will automatically dilate in order to see objects clearly.

3. Furry hair in the air: When a cat is scared or frightened, its fur will explode, its hair will stand on end while it will huff and puff.

4. Running around: Sometimes cats are fine, but suddenly they are running around in the room, as if they have seen a ghost. In fact, this may be caused by the cat in estrus. The cat’s mood will be worse after it is in estrus. If you get excited, you won't be able to control yourself.

5. Hiding in corners: When a cat feels scared, it is unwilling to face the object that makes it scared, and will hide in a corner where others cannot find it, especially at night. Like seeing a ghost.