The cat's pupils become a line that means it is frightened or frightened.

If it is not for the light, the cat's pupils become a line and are not a sign of happiness. This means that it is serious at the moment when it is judging whether the people and things around it will pose a threat to itself.

The cat's pupils will change with the strength of the light. According to the strength of the light, it will change from a date box to a vertical line to a circular state. In addition to the reason for light, when the cat's pupils become vertical lines, it means that it is now paying attention to the people and things in front of it, and is observing whether the people and things around it can pose a threat to itself. The pupils that shrink into a linear shape can be closed tighter, so they can adapt to a wider range of light conditions and can go out to hunt during the day or at night.

Cats usually have a small round pupil. This shape of pupils is the cat's relaxed state. If the cat's pupils become large round and they stare at you and make a whimpering sound, this action means that the cat is angry and it will attack you immediately.

However, some breeds of cats have natural pupils, which do not have any emotions, so it is normal for domestic cats to have small round eyes.