Cats show their anger through a variety of behaviors, including hissing, growling, and swatting. They may also display more subtle signs, such as flattening their ears, dilating their pupils, and arching their back. One of the most common signs of a mad cat is hissing. Cats will hiss when they feel threatened or scared, and it's usually a sign that they want you to back off. If your cat hisses at you, give them some space and let them cool off. Growling is another sign of a cat's anger. Cats may growl if they feel threatened or if they don't want you near them. If your cat growls at you, back away slowly and give them some space. Cats may also show their anger through swatting. This is when they hit out with their paw, usually at your hands or feet. Swatting is a warning sign that your cat is unhappy, so it's best to leave them alone and give them time to calm down. Finally, cats may use more subtle body language to show they are mad at you. If you notice your cat flattening their ears, dilating their pupils, or arching their back, it's a sign that they are feeling uncomfortable. Again, the best thing to do is to give them some space and let them calm down.