What does a cat with its tail up mean

If the cat has its tail raised straight up and shaking slightly, it means the cat is in a happy mood. When they feel safe in a place or are in a good mood, they will raise their tails like this. In addition, this is their way of showing off and showing that they are the masters of their territory.

If the cat’s tail is not only erect, but also the fur is standing on end, it means that they are extremely disturbed or are ready to attack. This is done to scare enemies or prey. They raise their fur to make themselves appear larger. Size is important in avoiding fights. Sometimes they do this out of fear, but most often it's for attack.