When the cat's tail is erect and the tip of the tail is slightly curved, it means that the cat has developed a strong interest in something, and its attitude is very friendly and willing to get close to you.

If the pet cat’s tail is slightly curved and the tip of the tail is slightly curved upward, it means that the cat is very satisfied with life at present. They are very leisurely and enjoy their current life.

A cat’s tail standing up and the hair on its tail blowing up indicates that it is threatened and fearful, which is a defensive posture.

When a cat feels extremely fearful, it will tuck its tail between its strands, making it look like it has no tail. An obedient cat will also do this when it signals to its peers that it has a low status in the cat group.