Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

5 Signs of Aggression in Cats: Vet-Reviewed Behavior Problems to Watch For

Scottish fold cat very angry and aggressive

Aggression is a relatively common feline behavior problem, and it can have several causes, from pets getting a bit too carried away while playing to pain and fear. Feline aggression can be quite serious, it can cause injuries and make life difficult for cats who are on the receiving end of the behavior. Signs of aggression may be subtle, for example the aggressor controlling access to resources, to obviously aggressive body language and physical fights. Keep reading to learn more about five signs of aggression in cats and how the behaviors impact those on the business end of the swats and pounces.

divider 1 paws

The 5  Signs of Aggression in Cats

1. Scratching and Biting

scratched wound on a man's leg by a cat
Image By: Kobzev Dmitry, Shutterstock

Cats sometimes react with aggression when they’re under the weather or in pain. Older cats who don’t feel well or who essentially just want to be left alone can lash out at younger pets who are interested in playing and having a good time.

When normally quiet and well-behaved cats scratch and bite other pets or people, it can sometimes be a sign of a health condition , and a veterinary checkup is necessary.


2. Attacking and Chasing

Cats are territorial creatures that feel most comfortable when their routine doesn’t change. Many cats don’t appreciate being asked to share their homes with new pets, which can lead some to lash out at new arrivals. Attacking and chasing other pets and family members is a sign of aggression.

Slow, controlled introductions that allow cats plenty of time to get used to each other’s presence can help prevent conflicts.


3. Tail Thrashing and Folded Ears

Cat Angry Scared
Image Credit: SerPhoto, Shutterstock

Cats sometimes get carried away when playing and end up going too far with the biting and pouncing. It’s often seen in younger cats who still have lots of energy. When they become aggressive, they’ll thrash their tail rapidly and fold their ears back.

Hand-raised kittens sometimes have trouble recognizing boundaries since they spent their formative weeks and months without playmates to help them learn how to interact nicely with others. Distracting cats who are about to shift into high gear is often all that’s needed to keep things under control.


4. Door Blocking and Harassment

In multi-cat households there is sometimes a ‘bully’ cat that acts aggressively toward other cats. Blocking doors is a way to control their movements and prevent other cats from coming and going as they please and accessing various resources within the home. These cats are often described as ‘dominant’ although the relationship within groups of cats is more complicated than a simple linear system.


5. Fluffed Up Fur and Hissing

cat meowing or chirping by the window
Image Credit: sophiecat, Shutterstock

Frightened cats are often clear about their feelings of discomfort, and you can see the effect an aggressive cat has on another feline. They frequently tuck their tails underneath their legs, their fur that stands straight up, and they may hiss.

Scared cats generally calm down if left alone and are allowed to remove themselves from the conflict. Defensive aggression sometimes results when scared cats feel cornered and can’t figure out how to escape.

divider 1 paws

Frequent Asked Questions

What Are Some of the Effects of Aggression Among Cats?

Bullied cats often restrict their movements to avoid coming into contact with their harassers. Many stay within certain areas to avoid getting into altercations when crossing into territory the other cat has claimed as their own. Fights can break out in homes with bullying issues unless there are places for cats to retreat.

Cats on the receiving end of long-term aggression can become incredibly stressed out and develop stress-related illnesses. Those who are being bullied sometimes have litter box issues, either because they’re being denied access to the restroom or due to stress.

Can Fearful Responses Make Things Worse?

Within a multi-cat household there may be potential bullies and fearful responses almost always make the situation worse for the cat being harassed. Aggressor cats pick up on the victim’s response and it can encourage their aggressive behavior; their posturing allows them to access the other pet’s food, treats, or toys.

close up cat meowing
Image Credit: Oscar Wiedemeijer, Shutterstock

Are There Ways to Encourage Cats to Get Along?

You can sometimes stop the aggressive behavior before it progresses into actual fighting and attempt to identify the trigger for the aggression.

Providing more than enough resources in multi-cat homes is vital for preventing competition over access to resources. Having more than enough food and water bowls, toys, scratching posts, and litter boxes can prevent ‘dominant’ cats from making life difficult for others.

Installing several high platforms or shelves where your cats can relax can also minimize conflicts over territory and calming pheromone products can also help. There is no quick fix for aggressive behavior and it’s advisable to contact a veterinarian for help, in some cases of ongoing inter-cat aggression you might need assistance from a veterinary behaviorist.

If you need to speak with a vet but can't get to one, head over to PangoVet. It's an online service where you can talk to a vet online and get the advice you need for your pet — all at an affordable price!

PangoVet_Mention-in-Content for PangoVet2 save money

divider cat paws 2 oct 2024

Final Thoughts

Most cats living in the same house get along fine, but some situations don’t work out. The signs of aggression between cats can range from the aggressor denying other cats access to important resources to full on fighting.

Cats on the receiving end of aggressive behavior often suffer from chronic stress and are unable to relax in their home, many get to the point where they get physically ill. Providing sufficient resources and giving resident cats time to adjust to the presence of new pets gradually and under controlled circumstances, can keep the peace in multi-cat homes.


Featured Image Credit: Anatoliy Cherkas, Shutterstock

How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.

Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

How To Tell Which Cat is Dominant? 5 Vet Approved Signs To Look For

Contrary to the aloof and standoffish stereotype that’s been given to cats, cats have a wide range of personalities and temperaments. Some may...

two cats playing on a hammock at home

Why Does My Cat Hate Other Cats? 6 Vet-Verified Possible Reasons

Cats thrive in various environments and as long as some requirements are met, they can live happily with others in stray cat colonies,...

two ginger cat fighting

Can Cats Get Jealous? How to Handle Cat Rivalry (Vet-Approved)

People tend to think of their pets as members of the family, interpreting their behavior and personality the same way that one would...

two cats drinking milk from the same bowl

Explaining Cat Behavior Problems: (With 9 Vet-Approved Solutions)

Veterinarians are regularly asked how to deal with certain cat behavior problems, such as peeing outside the litter box, attacking people, chasing other...

ginger tabby cat looking up meowing

More related

cat losing hair

Will Stress Cause a Cat To Lose Their Hair? Vet Approved Facts & FAQ

Several problems, conditions, and situations can cause a cat to lose its hair. One of those conditions is something we humans regularly face,...

Cat Angry Scared

Redirected Aggression in Cats: Vet-Verified Causes & How to Stop It

Redirected aggression occurs when a cat becomes frightened or overstimulated by something they can’t get to or do anything about and then attacks...

Black cat in fear and aggression

How Aggressive Are Bombay Cats? Tendencies & Behavior Tips

The Bombay cat is a beloved house cat in many households because of its sweet disposition. They enjoy snuggling up to their owners;...

Catster_Health Problems of Egyptian Mau

6 Egyptian Mau Health Problems to Watch Out For

Egyptian Maus share a long history with humans, as their name would suggest, but their connection to ancient Egyptian cats has not been...

Keep reading

10 Best Budget Cat Foods in Canada in 2025: Reviews & Top Picks

How lucky are we to have cats in our lives? Our cats give us so much and ask for little in return—except for complete devotion. An important part of looking after a cat is ensuring that they are on a...

grey cat licking lips after eating cat food from bowl inside on floor

Cat Splashes Water Out of the Bowl: 5 Vet-Verified Reasons & How to Stop It

While the behavior can be frustrating due to the mess, your cat splashing their water out of their water bowl and all over the floor is normal and usually no reason for concern. Despite having a reputation for being afraid...

a cat dipping its paws on a bowl of water

Can Cats Eat Arugula? Vet-Verified Nutrition Facts & FAQ

Arugula is a bitter and slightly spicy plant that we often put in salads. With its increasing popularity in health food recipes, it is common to wonder if it is safe and healthy to serve to your cat. So can...

Can Cats Eat Arugula

Why Does My Cat Clean Herself on Me? 4 Vet-Verified Reasons & When to Worry

Cats have quite a few strange behaviors. Even if you have been living with cats forever, you may still be surprised by their behavior every once in a while. For instance, some cats may clean themselves while lying in their...

cat sleeping on owner's lap

How Do You Give a Cat Lactulose? (7 Vet Approved Methods)

Lactulose is a stool softener often prescribed to ease feline constipation. The product pulls moisture into your pet’s feces, encouraging regularity by making bowel movements less dense. It’s also often prescribed for cats suffering from liver failure to reduce the...

feeding cat using syringe

7 Vet-Reviewed Tips for an Attention-Seeking Cat in a Multi-Cat Household

It’s no secret that our cats have very different personalities. If you are the owner of more than one kitty, you know just how different their love languages and attention requirements can be. So, if you have a cat that...

cat rubbing its head against the owner's legs

How Soon Can a Cat Get Pregnant After Giving Birth? Vet-Reviewed Facts & FAQ

Cats are adorable pets that bring millions of people joy and comfort. However, their reproductive cycles can be challenging to navigate, and many people wonder, how soon can a cat get pregnant again after giving birth? Depending on the geographical...

Pregnant cat laying on a staircase

Why Is My Cat Meowing a Lot Suddenly? 6 Vet-Reviewed Reasons

Cats can be very vocal creatures! Sometimes, the reason why your cat is being so vocal is because they’re simply letting you know they need something, or perhaps they just like to hear themselves talk. A few breeds are anecdotally...

british-shorthair-cat-meowing