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.

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

two ginger cat fighting

Cats thrive in various environments and as long as some requirements are met, they can live happily with others in stray cat colonies, with one or more companions at home, or on their own. However, domestic cats are, by nature, solitary creatures who hunt on their own and are territorial. They are programmed to avoid encroaching on other’s space to avoid massive resource competition and conflict. If your cat dislikes other felines, it may be the consequence of not having enough positive experiences with other cats during the socialization period when they were kittens, between 2–7 weeks of age, and later in life.

divider 3 paws

Territoriality, Conflict Resolution, and Change

Cats are most comfortable when they have territories of their own to command, and they may not be well suited to conflict resolution since they didn’t develop in social groups. Unrelated cats living with each other can trigger cats’ territorial instincts, particularly if there’s resource competition.

Some cats, particularly those who have lived with others since kittenhood, enjoy the presence of other cats, while those who have spent lots of time on their own are often less than thrilled when asked to share space.

Introducing a new feline to the home brings changes, which can be particularly difficult for adult cats who have lived their entire lives as singletons to adjust to, which can lead to stress and aggressive behavior along with problems such as spraying and excessive grooming.

tabby cat spraying outdoors to mark territory
Image Credit: Helen Liam, Shutterstock

The 6 Factors That Cause Cats to Dislike Being Around Other Cats

Whether a cat gets along well with other cats has a great deal to do with their age, background, and personality, but other factors can also play a role, such as how they were socialized and whether your cat’s personality meshes well with that of the other cat.

1. Lack of Socialization

Cats that don’t receive sufficient socialization during their sensitive period tend to have serious difficulties understanding how to interact with other cats. Socialization involves exposing kittens to different situations and animals to allow them to become comfortable navigating unfamiliar situations, being handled by people, and interacting with other pets.

Kittens’ are most open to the process during their sensitive period, between 2 and 7 weeks old. Cats that never really learned how to play well, or interact positively with others sometimes exhibit behavior that’s not appreciated by other cats and can easily be interpreted as aggression.


 

2. Routine Disruption

Cats enjoy routine and having a predictable environment. Since cats can’t rely on clocks to determine how late it is and what activity should come next, they typically rely on external clues from regular activities to tell them what to expect next during the day.

Significant disruptions, such as suddenly introducing another cat to the home, can create stress for some cats. They usually have an easier time accepting other cats when the introductions are taken slowly, and both pets have time to become used to the other. Cats that are feuding can calm down if given enough time apart and reintroduced to each other slowly.


3. Territoriality

Cats are territorial creatures that are often not interested in sharing their space with others. Cats use pheromones to mark their territory and let others know to stay away. They have scent glands around their chins and whiskers and in between their paw pads.

Cats may also use urine to establish their boundaries, and those who aren’t used to living with others can sometimes go into territorial overdrive when triggered by the presence of a new cat. Ensuring that the territory satisfies the needs of all cats in the household is crucial for creating a harmonious living situation.

cat fight
Image Credit: Tatiana Kovaleva, Shutterstock

4. Resource Competition

Pets in multi-cat households can fight over resources if asked to share things such as scratching posts, litter boxes, hiding spots, and cat trees. One resource per cat, plus an extra, is a good guideline for keeping things calm in multi-pet homes.

Having at least three water bowls for two cats, placed well apart from each other, for instance, can prevent aggressive cats from blocking the other’s access to resources. Put food, water bowls, and litter boxes in various locations to make it easy for pets to meet their basic needs without engaging in unwanted interactions. You can provide several scratching posts, beds, toys, and cat trees so the cats don’t have to share.


5. Maternal Instincts

Queens who have just given birth can sometimes lash out aggressively to keep other cats at a distance, particularly when their kittens are young. Mother cats strongly prefer to give birth and spend the first few weeks after delivering kittens in calm, quiet environments.

They’ll often move kittens from one place to another if they’re concerned about the level of activity. Queens who are actively trying to keep a cat away from her kittens may hiss, growl, or even bite the intruder to encourage them to keep moving. These issues usually resolve once kittens are a bit stronger and able to get around on their own.

mother cat with kittens
Image Credit: Karen Hogan, Shutterstock

6. Differing Personalities

Some cats get along perfectly well with one cat but have zero interest in hanging out with others. Confident and spunky cats may not mesh well with timid pets, and two assertive, unrelated, unneutered male cats of the same age may have difficulty being around each other without aggression making an appearance. Older cats may be more inclined to accept kittens, but senior cats may not enjoy dealing with energetic felines.

divider 3 paws

Are There Ways to Help Cats Get Along?

In addition to having sufficient resources to minimize competition between pets and providing an enriched environment, there are also other steps you can take to encourage peace, such as ensuring that introductions are done very gradually and making sure they have safe ways to get away from each other when situations become too heated.

Hiding Places and Perches

You can install several high perches to provide places for cats to escape when feeling stressed. Cozy hiding places where they can rest in peace can also go a long way towards defusing conflict.

Distraction

Once patterns of aggression get started, they’re often hard to stop, so putting an end to conflicts before they progress is important to maintaining a calm environment. Distracting cats with loud noises or toys often convince them to engage in other activities.

Training

Cats generally respond well to positive reinforcement; punishment can increase stress levels and make things worse. Rewarding cooperative behavior and giving worked-up cats time to relax alone can sometimes lead to fewer household fireworks. Separating cats and giving them time to get to know each other (again) slowly under controlled circumstances may also help, and behavioral therapists or veterinarian can provide expert guidance as well.

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 3 paws

Conclusion

Cats share many behaviors with their wild relatives, and they haven’t been domesticated for very long. Cats in the wild prefer living and hunting independently, but they can live in groups or pairs.

Cats are territorial; they like to live and hunt in spaces largely off-limits to other cats. When they live in groups, the members are often related, and there’s usually little resource competition. Unrelated companion cats can become stressed when asked to share space largely due to their innate territoriality, but how cats react to others also has to do with factors such as personality type and level of socialization.


Featured Image Credit: Konstantin Dem, 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

Why Don’t My Cats Cuddle With Each Other? 10 Vet-Approved Reasons

There are few things cuter than the sight of two cats snuggling together. When they start grooming each other, your heart just melts....

together two cats with different fur colors

The 6 Common Reasons Why Your Cat Guards Your Door

Cats come with all kinds of cute quirks, including their guarding behaviors. As aloof or indifferent as our cats can often appear, it’s...

a cat by the door

Why Does My Cat Bite My Ear? 10 Vet-Verified Reasons

Cats have long intrigued us with strange behaviors. One of the more unusual and often perplexing behaviors that some cats exhibit is the...

cat on woman's shoulder by head bite hair

Why Do Cats Bite Each Other’s Necks? The Interesting Reasons

If you have more than one cat, you may have noticed that cats have a tendency to bite each other on the neck....

Orange cat biting black cat on the neck

More related

Orange cat biting black cat on the neck

Why Do Cats Bite Each Other’s Necks? The Interesting Reasons

If you have more than one cat, you may have noticed that cats have a tendency to bite each other on the neck....

Why Does My Cat Sit On Me All The Time? 6 Vet-Verified Reasons

Cats, for the most part, are not always the most affectionate creatures in the world, and for many cat lovers, this is precisely...

cat biting woman's chin

Why Does My Cat Bite My Chin? 6 Vet-Verified Reasons for This Behavior

Cats have myriad ways in which they choose to express their emotions to humans. Some of the more common methods include meowing and...

two cats drinking milk from the same bowl

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...

Keep reading

Birman Cat Health Problems: 14 Common Issues

If you’re a Birman parent—lucky you! These gorgeous purr-machines always win hearts with their beauty and affectionate natures. Cat parenting does come with many worries, though—especially if your furbaby gets ill or you’re concerned about congenital illnesses. In this post,...

Catster_Health Problems of Birman Cats

Does Lime Kill Fleas on Cats? Vet Reviewed Effectiveness & Safety Explained

Fleas can make your cat’s life miserable and yours a nightmare as you try to fight the infestation. Those searching for non-pesticide products to kill fleas might wonder if lime is an effective alternative. While lime may be somewhat effective...

Lime inside plastic bag

Where Do I Put Cat Food & Water Bowls? 6 Vet-Reviewed Options

Though the placement of your cat’s food and water bowls may seem like a minor consideration, it is a lot more important than some may think. Cats are fastidious animals that need routine and love having a calm, quiet, safe...

owner feeding his cat

Petting Aggression: Why Cats Bite the Hand They Love & What to Do (Vet-Approved)

You’re sitting there ever-so-innocently petting your beloved feline, and—ouch! That really hurt! Your cat has turned to bite you. Some will flop on their bellies, grab your hand, and kick; others will sound disgruntled as if it were a warning...

aggressive cat biting human hand

What’s the Price of an Ultrasound for a Cat? 2025 Guide

Veterinary care can be expensive. Whether your cat needs an ultrasound for reasons related to pregnancy or a medical condition, there can be some hefty expenses associated with the procedure. The cost varies depending on the type of ultrasound, your...

cat having an ultrasound in vet clinic

Indoor vs. Outdoor Cat Food: Vet-Reviewed Nutritional Differences

You’ve probably stood in the cat food aisle of your local grocery or pet store and marveled at the sheer number of options available. There is seemingly a special type of cat food for every cat out there. There are...

outdoor vs indoor cat food

Feline Cognitive Decline: Vet-Reviewed Signs, Diagnosis & Treatment

Watching your cat age can be devastating. It’s even harder when you notice behavioral changes taking place that your cat doesn’t appear to have any understanding of or control over. Feline cognitive dysfunction is a common condition that occurs in...

male veterinarian with stethoscope holding striped cat

Do Feral Cats Meow? Vet Reviewed Facts

If you own a cat, you know many are anything but quiet. Cats meow at you for any reason, and some constantly chatter throughout the day. While feral cats may look like regular cats, they behave differently. So do feral...

two-feral-cats