Why Does My Cat Hate Other Cats? 7 Possible Reasons

Cats thrive in various environments and can live happily with others in feral colonies, with one or two companions, or on their own. However, domestic cats are, by nature, solitary creatures who hunt on their own and are territorial. They’re programmed to avoid encroaching on other’s space to avoid massive resource competition and conflict. If your cat dislikes other felines, they may not have spent much time with unrelated cats when they were kittens.

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 create stress, as these situations often 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. Other common signs of feline stress include stomach issues, excessive scratching, withdrawal, and lack of appetite.

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

The 7 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 while young sometimes have difficulty 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 between 2 and 7 weeks old. Cats that never really learned how to play well with others sometimes exhibit behavior that’s not appreciated by other cats and can easily be interpreted as aggression.

2. Only Cat Preferences

Cats that grow up alone after moving to their forever homes sometimes don’t enjoy the company of other cats. Those accustomed to living alone may not react well if asked to share space with another cat, even temporarily.

Grieving cats that recently lost a feline companion can sometimes find the presence of new cats or dogs in the home to be stressful, which can lead to less-than-welcoming behavior.

cats fighting
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3. Routine Disruption

Most cats enjoy routine; it’s part of how they understand the passage of time. 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 introducing another cat to the home, can create stress for some cats. They 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.

4. 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 also use urine to mark their territory, 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. Spaying and neutering can reduce problems with their territory and other behavioral issues.

cat fight
Image Credit: Tatiana Kovaleva, Shutterstock

5. Resource Competition

Pets in multi-cat households can fight over resources if asked to share things such as scratching posts 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 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.

6. 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

7. Differing Personalities

Some cats don’t 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.


Are There Ways to Help Cats Get Along?

In addition to having sufficient resources to minimize competition between pets, there are also other steps you can take to encourage peace, such as ensuring cats have lots of time to adjust to the other’s presence 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.


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.


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 can provide expert guidance as well.

himalayan cat eating treat
Image Credit: Piqsels

cat paw divider


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

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