Cats keep purring and vibrating and keep opening their mouths are mainly explained that they are in a good mood and feel good, which means that they are very comfortable, or feel at ease around their owners, so they make this sound. Especially when it wants to sleep, it can clearly feel that the sound becomes more and more obvious.

Sometimes the cat stretches its limbs, very lazy Occasionally, it also makes a purring sound.

Also, cats purr when they are sick or in distress. If a kitten or a big cat keeps purring under any circumstances, it may be a respiratory infection.

Uncomfortable, sometimes the cat will purr when it is uncomfortable. It is using this sound to soothe its emotions.