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Do Well-Adjusted Cats Sometimes Get Into Fights?

Last Updated on June 26, 2015 by

Cat fights are awful, especially when the cats at war are yours. The cats may have a history of skirmishes, or it may be a heartbreaking first-time event. The causes of inter-cat aggression vary as much as the intensity of the brawls. At times the violence is surprising — cats who’ve sweetly spent their whole lives together suddenly are sworn enemies. Other times the behavior is almost expected, the cats have a long history of violence.

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Two cats starting to fight. by Shutterstock.

Although the causes of conflicts may not always be obvious, cats won’t fight unless they have a good reason to. The following are some of the root causes that lead to problems between cats:

Pain and discomfort

Animals are not on their best behavior when they don’t feel good — cats included. They sometimes show their pain and discomfort by lashing out at nearby animals or by being cranky. Often, the unlucky recipients are other resident cats.

Toothaches, arthritis, and urinary tract infections along with other painful medical conditions can transform a normally mellow kitty into one who is combative. Chronic pain can also cause chronic irritability. Feeling poorly affects moods, no matter the species.

Cats who are acting out with unexplained aggressiveness should be thoroughly examined by veterinarians. Also, be mindful of sensitivities. Cats will cry, bite, or shy away when sensitive areas are touched.

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Aggression can indicate there’s a medical problem. by Shutterstock.

Redirected aggression

Redirected aggression is serious and makes best friends into sworn enemies. This is usually caused by neighborhood animals who the resident cats can see but cannot reach. The agitated kitties, unable to access the outsiders, vent their frustrations on whoever is closest. Many times, the recipient is a cat whom they are bonded too.

Take redirected aggression seriously, and immediately separate the cats from each other without getting scratched or bitten. Place the aggressor in a darkened room with food, water, litter box, and a place to sleep. It can take a day, sometimes longer for cats to calm down. In severe cases, cats have to be gradually reintroduced to each other.

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Neighborhood cat. by Shutterstock.

Home from the vet clinic

Sometimes cats don’t receive warm welcomes from the other resident kitties after visiting veterinarians. Instead of nose touches and head butts, their housemates greet them with hostility. Although heartbreaking, it is understandable.

Cats are very smell-oriented. Their sense of smell helps them recognize family and friends as well as identify potential threats. It also helps them orient themselves in their environments. Vet clinics are scary places, complete with unfamiliar and unpleasant odors. Medications, antiseptics, and other odors cling to fur, making felines smell alien. When these kitties come back home from the clinics, the other resident kitties don’t recognize them. They may look familiar, but they smell weird.

You can stop this aggression before it begins. Before taking your kitty to the clinic, gently massage her with a soft towel so that it picks up her scent. Place the towel in a sealed plastic bag. When you come back from the veterinarian, remove the towel from the bag and pet her with it, so that she smells familiar to the residents. If you forget, then transfer your smell onto her as soon as you are home by petting her with an item of clothing you are wearing that has your scent on it.

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Transfer the cat’s smell back on her after she comes home from the vet. by Shutterstock.

New cat

Cats are territorial and generally don’t immediately feel warm and fuzzy about other felines moving in. Although bringing home a new buddy for your kitty can be a good idea, introducing them too quickly isn’t. Of course there are exceptions, but as a general rule, poorly done introductions usually lead to violence.

In addition to reducing the stress and minimizing the fighting, gradual introductions can encourage cats to become friends. Start by keeping the cats separated from each other. They need their own sanctuary rooms, places they can feel secure. Introductions are done in phases, first by introducing scent, than using food as a tool for peace. Adjust your own sense of time — successful and stress free introductions can take months.

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Two cat friends. by Shutterstock.


Peaceful households change into war zones when cats bicker over their places in the hierarchy. Positions aren’t static — placement is not assured. Cats take turns, their positions shift, depending on many factors including other cats, illness, and changes in the household. Squabbling isn’t unusual when one or more of the cats is between the 8 months and a couple of years old. They are at a crucial age — teenagers trying to figure out where they fit in. The dynamics are also changed when a cat dies or is rehomed. The loss opens up a place that needs to be filled.

It is easy to see who’s who in the hierarchy. Cats show their status by where they sit in relationship to others. Those who occupy a high position on the social ladder hang out in the highest spots. You’ll find these high achievers on the top shelves of cat condos or up high on book shelves. You can also spot them monopolizing favorite spots warmed by the sun.

You can help restore peace by increasing the vertical territory. Buy or make cat trees and install shelves. Book shelves, armoires and other household furniture can do double time as vertical territory. Additionally, increasing the number of scratching posts and horizontal scratchers will help ease tensions because cats mark their territory by scratching.

Cats have flexible hierarchies. by Marilyn Krieger.


Watch out when the hormones are in control. Whole, sexually mature males will fight to defend their territories and become particularly fractious when there are receptive queens (unspayed females) nearby. Queens aren’t exempt from violence either. They can become particularly cranky toward other females when they are in heat. They will also defend their newborns against all perceived threats.

In addition to helping with population control, spaying and neutering cats reduces inter-cat aggression. It can take six to eight weeks after the procedures until the hormones are out of their systems.

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Mother caring for her newborn kitten. by Shutterstock.

Different ages

Differences in age can create havoc. Sometimes kittens are adopted to be companions for older, adult cats. Although people’s intentions are good, it doesn’t always work out as planned. Kittens want buddies they can have intense long play sessions with, while older cats are calmer, preferring quiet naps to high-energy, incessant play. The differences in opinion typically begin when adults, rejecting the youngsters annoying overtures, are ignored.

Avoid the problem by adopting compatible cats. New kitties should be around the same age as the resident cat and be about as playful. Also, become familiar with the histories and personalities of the cats. Be on the lookout for kitties who get along well with other felines and have personalities that are compatible with your resident kitty. If you have your heart set on adopting a kitten, adopt two. Most likely, they will keep each other entertained and ignore the oldster.

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Kittens keep each other company. by Shutterstock.

Aggression doesn’t occur in a vacuum — there are always reasons. You can stop many of the battles before they begin by addressing the underlying causes.

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Got a cat behavior question for Marilyn? Ask our behaviorist in the comments below and you might be featured in an upcoming column. If you suspect a behavioral problem, always rule out any possible medical issues that may be causing the behavior by first having your cat examined by a veterinarian. Marilyn can also help you resolve cat behavior challenges through a consultation

Marilyn, a certified cat behavior consultant, owner of The Cat Coach, LLC, solves cat behavior problems nationally and internationally through on site, Skype and phone consultations. She uses positive reinforcement, including environmental changes, management, clicker training and other behavior modification techniques.

She is also an award winning author. Her book Naughty No More! focuses on solving cat behavior problems through clicker training and other positive reinforcement methods. Marilyn is big on education — she feels it is important for cat parents to know the reasons behind their cat’s behaviors. She is a frequent guest on television and radio, answering cat behavior questions and helping people understand their cats.

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