Redirected Aggression in Cats: How to Stop It and How Long It Lasts
Redirected aggression in cats happens when a cat attacks the nearest person or pet after seeing a cat outside or hearing a loud noise. Here is how to stop an episode safely, how long it lasts and how to reintroduce your cats.
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Redirected aggression in cats happens when a cat gets worked up by something it cannot reach, such as a strange cat outside the window, and attacks whoever is closest instead: you, another cat or the family dog. The attack looks unprovoked, but it is not. Your cat is reacting to the trigger, and you simply walked into the line of fire.
When Tim and I were first married, we took in feline lodgers for friends now and then. Our cats, Cricket and Kilah, never went after the guests. The sisters turned on each other instead, with a full "it's your fault; no, it's your fault" drama. We thought it was funny. We didn't know it had a name, or that redirected aggression in cats can wreck a friendship between housemates for weeks if you handle it the wrong way.
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What is redirected aggression in cats?
- 1Redirected aggression is an attack on the nearest person or pet when a cat is aroused by something it cannot get to.
- 2The classic trigger is an outdoor cat seen through a window, but loud noises and strange smells can set it off too.
- 3Never pick up or punish an aroused cat. Separate the cats and leave the attacker alone in a quiet, dark room.
- 4Arousal can fade in about 30 minutes or last for days, so reintroduce cats slowly, with food.
Picture your cat on the windowsill. A neighborhood tom, an outdoor cat seen through a window, strolls across the lawn. Your cat's tail puffs, the pupils go wide, and a low growl starts. Then your other cat wanders in, or you reach down to see what's wrong, and your cat explodes at the closest target. As animal behaviorist Jim Ha puts it, the cat "will exhibit an appropriate behavior at an inappropriate target."
VCA Animal Hospitals describes it the same way: the cat is aroused by another animal, person or event but cannot direct its aggression at that stimulus, so it lands on someone else. A 2019 review of owner-directed aggression in the Journal of Feline Medicine and Surgery lists redirected aggression as a common type of feline aggression and one of the more dangerous ones for people, because the attacks are sudden and intense.
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Cat behaviorist Pam Johnson-Bennett notes that it is "often misdiagnosed as unprovoked aggression because it appears as if the cat is lashing out for no reason whatsoever." Your outraged cat isn't really seeing you, the other cat or the dog. It is seeing the intruder, and whoever happens to be nearby becomes the stand-in. That is also why a cat redirects aggression toward humans: you are simply the nearest target when the arousal boils over.
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Common triggers of redirected aggression in cats
Another cat is the most frequent trigger, but almost anything that spikes your cat's arousal can start an episode. The usual suspects:
- An outdoor or stray cat seen or smelled through a window, screen door or patio door
- Loud noises: fireworks, thunder, construction, a dropped pan, a smoke alarm
- Unfamiliar people in the house, from party guests to repair workers
- Wildlife outside, such as birds at the feeder, squirrels, raccoons or a fox
- A housemate coming home from the vet smelling of the clinic
- A fight or tense standoff with another cat in the home
- Pain, or being handled roughly, while already on edge
The vet-smell trigger catches a lot of owners off guard. Ha once worked with a cat named Milo who suddenly began shredding the curtains. The detective work turned up a housemate who had spent a night or two in the veterinary hospital and come home a day before the first curtain attack. Milo hated the vet, and his friend now smelled like it.
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Warning signs before an attack are often subtle, but watch for:
- A fixed stare and dilated pupils
- Ears turned sideways or flattened
- A twitching or lashing tail
- Fur standing up along the back and tail
- Growling, and odd, restless pacing from window to window Why do cats suddenly turn aggressive? Usually because of a trigger you did not notice, such as a cat in the yard or a noise in the next room. If you cannot find any trigger at all, pain or illness may be the cause, which is covered in the treatment section below.
Visitors are their own category of trigger; if your cat gets aggressive mainly when company comes, our guide to why a cat is aggressive around house guests covers that pattern.
If the tension started when one cat began getting more of your attention, with no outside trigger, read our guide to jealous cat behavior and how resource competition differs from redirected aggression.
How to stop redirected aggression in cats during an episode
When it comes to how to stop redirected aggression in cats, our instinct is to rush in, grab the cat and soothe them. Don't. In one case Animal Friends of Connecticut handled, a young Abyssinian mother named Sabrina lunged at a screen door when a tomcat lurked outside. Her owner's girlfriend stepped in between and was badly clawed and bitten. Sabrina wasn't mean. She was protecting her kittens, and the person who got in the way became the target.
- Do not pick up, hug or try to comfort the cat. Do not punish, yell, swat, spray or hiss back at the cat, because punishment raises arousal and teaches your cat that you are a threat. Do not reach between fighting cats with your hands. Do clap loudly or drop a cushion between fighting cats to break their focus, use a blanket or a piece of cardboard as a barrier to herd the cat into another room, then close the door, dim the lights and walk away.
The safest way to deal with redirected aggression in cats in the moment is distance. VCA recommends avoiding the cat until it calms down and, if another cat is the target, separating the two. Move the aroused cat (or the victim, whichever is easier) into a quiet room with water, a litter box and a hiding spot, then turn off the lights. A dark, quiet room lowers stimulation and helps the cat settle. Preventing redirected aggression in cats from turning into a long feud starts right here, in the first hour.
Dr. Nicholas Dodman once found two of his cats, a mother and daughter who were the best of friends, nose to nose with a visiting tom through the screen door. Before they could turn on each other, he herded them into separate rooms using a chair "like a lion tamer" and kept them apart overnight. In the morning he reintroduced them only once they were acting calmly, and they never showed hostility to each other again.
How to fix redirected aggression in cats long term starts with not making the first episode worse. Should you hiss back at a cat that hisses at you? No. Hissing back reads as a challenge and can push an aroused cat into attacking. Should you discipline a cat for being aggressive? Also no. The JFMS review and VCA both warn that punishment and frightening interventions are the main reason aggression between cats keeps going after the trigger is gone.
How long does redirected aggression last in cats?
How long does redirected aggression last in cats? The arousal lasts anywhere from about 30 minutes to several days. The 2019 JFMS review notes that while some cats remain aroused for only 30 minutes or so, others can stay aroused for days, and the risk of another attack is high the whole time. VCA reports the same range: some cats need only a few minutes apart, but hours or days of separation are not unusual.
| Stage | What is happening | What to do | Safe to move on when |
|---|---|---|---|
| First 30 minutes | Peak arousal: dilated pupils, growling, lashing tail | Separate, dark quiet room, no contact | Cat lies down, grooms or eats |
| 30 minutes to a few hours | Arousal fading but easily restarted | Check briefly, offer a treat, leave if it will not eat | Cat greets you normally and takes food |
| Same day to 2 days | Some cats stay tense or hiss at the housemate | Keep apart, swap bedding for scent, offer play through a closed door | Both cats eat and play near the shared door |
| Days to weeks | Victim may now fear the attacker | Start the staged reintroduction below | Calm meals at close range |
Can redirected aggression in cats be cured? Yes, in most homes. A single episode handled calmly often resolves as soon as the cat settles. The cases that drag on are the ones where the victim cat fought back, someone punished the attacker, or the cats were thrown back together too soon. Then the fear and defensiveness become their own problem, and the cats need a structured reintroduction.
Mimics the maternal pheromone mother cats release to calm kittens, positioned for harmony between cats that live together.
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Treat each stage of the episode as a checkpoint, and move on only when it is safe: the cat eats, grooms or greets you normally. While a cat is confined, VCA suggests checking in, offering food or a favorite treat, and leaving again if the cat is still fearful. A treat puzzle in the safe room gives the cat something calm to do while it waits.
Redirected aggression in cats towards humans
Redirected aggression in cats towards humans works the same way as between cats. Why does a cat redirect aggression toward humans? Because you are the nearest target when the arousal boils over. You walk past the window at the wrong moment, or you reach down to pet a cat that is staring at the yard, and the cat attacks your legs or hands with real force. Feline redirected aggression towards humans can be startling because the cat may be your gentlest companion the rest of the time.
The JFMS review notes that redirected attacks on owners can cause serious wounds and that owners should get medical attention when needed. It also advises putting off a vet visit for the cat until it is calm again, since handling an aroused cat invites another attack.
- Wash the bite with soap and running water right away and see a doctor the same day if the skin is broken. Cat bites are deep puncture wounds that infect easily, especially on the hands.
How should you discipline a cat for being aggressive toward you? Don't punish it. Yelling, swatting or spraying only adds fear to arousal and makes the next attack more likely. Walk away, close a door between you, and reward calm behavior later with a treat or play.
Read more on why cat bites are serious and when they need antibiotics. If the attacks happen mostly at night, while your cat stalks your ankles under the covers, that is usually play or predatory behavior rather than redirected aggression; see why does my cat attack me at night.
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How to reintroduce cats after redirected aggression
When redirected aggression in cats towards other cats leaves the victim scared or defensive, VCA says the biggest mistake owners make is bringing the cats together too soon. Reintroduce cats slowly, with food. Cats fighting after redirected aggression need to relearn that the other cat predicts good things. WebVet's step-by-step guide to how to introduce cats is a useful companion to the plan below.
Feathered teaser wand with catnip-stuffed bird. Pairs perfectly with the no-bite training policy: redirect Bengal play drive into a 10-minute interactive session with the wand.
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- Keep the cats fully apart, behind a solid door, until both are calm and eating normally.
- Swap scents. Rub each cat with a towel and leave it with the other, or swap bedding and litter boxes between rooms.
- Feed the cats on either side of the closed door, then on either side of a baby gate or a door cracked open a few inches.
- Move to meals in the same room at 10 to 20 feet apart, with harnesses on if you want more control.
- Shrink the distance a little at each meal over several days, and keep sessions short and positive.
- Add play. A wand toy with feathers or a catnip mouse, waved on either side of a slightly open door, gets both cats chasing the same toy instead of each other.
- Step back to the previous stage the moment either cat stares, growls, hisses or refuses food. Refusing food means the cats are too close.
A pheromone diffuser in the shared area can help. Feliway MultiCat is the version made for tension between cats in the same home, and VCA notes that pheromone sprays or diffusers may help calm very agitated cats. Our Feliway reviews compare Classic, MultiCat and Optimum. WebVet also explains whether cat pheromone diffusers are safe around other pets and people.
Some cats reconcile in a day. Others need weeks of this routine, and behaviorists report rare cases where cats had to live apart for months.
How to prevent redirected aggression in cats
To prevent redirected aggression in cats, aim for fewer triggers, a blocked window view, a pheromone diffuser and plenty of enrichment for a calmer baseline. Cornell's Feline Health Center recommends removing or avoiding the stimulus, for example by pulling down a window shade or keeping stray cats away from the window. Johnson-Bennett calls these "environmental modifications to reduce your cat's chances of exposure to the triggers."
| Trigger | Practical fix |
|---|---|
| Outdoor cat at the window | Frosted window film on the lower half of the glass, closed blinds at peak hours, or blocking the sill |
| Strays in the yard | Remove bird feeders and food sources, secure trash, use motion-activated sprinklers |
| Loud noises | A safe room with a white-noise machine during fireworks or storms |
| Visitors and workers | Shut the cat in a quiet room before they arrive |
| Vet-clinic smell on a housemate | Keep the returning cat apart for a few hours and rub it with a towel from home |
| Tension between cats | Pheromone diffuser, extra litter boxes, food bowls and perches in separate spots |
Kathie Cote uses decorative window film in her house. Her cat Titan used to go from window to window with a horrible yowl whenever an outdoor cat showed up. At the treated windows, he's fine.
What calms down aggressive cats? Four things do most of the work:
- A predictable daily routine
- Places to climb and hide
- A quiet, dark retreat
- Feline facial pheromone
Pheromone diffusers release a synthetic copy of the facial pheromone cats leave when they rub their cheeks on things. For a single cat that redirects at people, a Feliway Classic diffuser in the room where the cat spends most of its time is the usual choice. In a multi-cat home, MultiCat suits better; a three-pack of MultiCat refills covers about three months, and the Comfort Zone MultiCat diffuser is a lower-cost alternative with the same goal. To be fair, results vary. My own cats seemed calmer with diffusers at first, then started spraying after a few days, so watch your cat rather than the box.
Play matters more than most people think. Cats are predators, and a cat with no outlet for the hunt is a cat with arousal to spare. Set a daily play schedule with a wand toy:
- Two or three 10 to 15 minute sessions a day with a feather wand toy, ending with a catch and a small meal or treat
- A session right before the times outdoor cats usually show up, often dawn and dusk
- Food puzzles so part of each meal is a hunt; the Catit Senses 2.0 Food Tree is an easy starter
- Cat trees and shelves so each cat can watch from height and get away from the other
Redirected aggression in cats treatment: medication and when to get help
Redirected aggression in cats treatment has three parts: separate after an episode, identify and block the trigger, and change how the cat feels about it. Desensitization and counterconditioning do the last part. The cat is exposed to a weak version of the trigger, such as a recording of fireworks played very quietly or a view of the yard from across the room, while it eats something wonderful, and the intensity rises only as long as the cat stays relaxed. The JFMS review stresses that this training should only happen when the cat is not aroused. Feliway for redirected aggression and medication for redirected aggression in cats both support this plan; neither replaces it.
Medical causes and medication
Medical causes of sudden aggression are easy to miss. Pain from arthritis, dental disease or an injury, hyperthyroidism, and conditions that affect the brain can all make a cat irritable and quick to attack. Any cat with new, unexplained aggression needs a vet exam once it is calm enough to handle safely. If your cat's behavior has changed and you are not sure how urgent it is, WebVet's sudden behavior change checker can help you sort out next steps.
Medication from your vet is a tool, not a fix by itself. Your vet may prescribe fluoxetine or another daily anti-anxiety medication for a cat that stays reactive, or gabapentin before predictable stressors such as a vet visit. Older drugs like diazepam are used far less now because of side effects, including sedation. Any medication works alongside behavior modification, never instead of it, and only your vet can choose the drug and dose.
Is Feliway for redirected aggression worth trying? It is low risk and helps some cats, which is why both VCA and the JFMS review mention pheromones, but it will not override a trigger the cat sees every day. Use it with the trigger fixes above.
When to see a veterinary behaviorist
Call your vet, and ask about a referral to a board-certified veterinary behaviorist, if:
- Attacks on people break the skin or happen more than once
- Your cats have not reconciled after two to three weeks of a careful reintroduction
- The aggression started suddenly in a cat that used to be calm
- You cannot identify the trigger at all
- There are children, older adults or anyone with a weakened immune system in the home
These are only a few ways of dealing with the problem. But the point is, there are ways, and they're worth trying.
Redirected aggression in cats FAQs
Separate the cats right away and leave the aroused cat alone in a quiet, dark room until it is calm. Then find the trigger and block it, reintroduce cats slowly with food, and ask your vet about pheromones or medication if episodes keep happening.
Most cats calm down within about 30 minutes to a few hours, but some stay aroused for days. Keep the cats apart until both are relaxed and eating normally, then reintroduce them gradually.
Because you are the nearest target. When a cat is wound up by something it cannot reach, such as a cat outside, any person who comes close can take the hit. It is not personal, and it usually stops once the trigger is managed.
No. If you hiss back, your cat reads it as a threat, which can escalate an aroused cat into an attack. Give the cat space and let it calm down on its own.
Distance, a dark quiet room, time and a predictable routine. A pheromone diffuser, daily play and places to climb and hide help lower a cat's baseline stress so episodes happen less often.
Don't punish an aggressive cat. Yelling, spraying or swatting raises arousal and fear and makes future attacks more likely. Instead, discipline here means managing the trigger, rewarding calm behavior and interrupting fights with a loud noise or a barrier rather than your hands.
Sudden aggression can be redirected aggression from an unseen trigger, but it can also signal pain or illness such as arthritis, dental disease or hyperthyroidism. Have your vet examine any cat whose behavior changes suddenly.
T.J. Banks is the author of several books, including Catsong, which received a Merial Human–Animal Bond Award. A contributing editor to laJoie, T.J. also has received writing awards from the Cat Writers’ Association (most recently a Certificate of Excellence in 2019), as well as from ByLine and The Writing Self. Her work has appeared in numerous anthologies, including Chicken Soup for the Single Parent’s Soul and A Cup of Comfort for Women in Love, and T.J. has worked as a stringer for the Associated Press, as an instructor for the Writer’s Digest School and as a columnist.
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