Care & how-to
Why Do Cats Hiss? What It Means and What to Do
A cat hisses as a warning: back off. It is usually a defensive sound made by a cat that feels frightened, threatened, cornered or in pain, rather than a sign of a mean cat. VCA describes the hiss as a warning that may include spitting. The right response is to give the cat space and work out what upset it, never to punish it.
By Matt GarnettUpdated November 14, 20264 min read3 sources
What a hiss means
When a cat hisses, it opens its mouth, pulls the lips back to show the teeth and forces air out in a sharp rush. It is often paired with flattened ears, dilated pupils, an arched back, raised fur, a puffed tail and sometimes a spit or a low growl. The ASPCA notes open-mouthed hissing or spitting as part of defensive postures.
The message is to stop and keep your distance. Most of the time a hissing cat would far rather not fight; the hiss is an attempt to avoid one. VCA notes that if the warning is ignored, a cat may escalate to swatting, scratching or biting.
Common reasons cats hiss
Fear is the most common. Cornell lists unfamiliar people, animals and noises, and unpleasant experiences like vet visits, as triggers for fear-related aggression. A cat may hiss at a new pet, a visitor, a dog through the window, a vacuum cleaner or being picked up when it does not want to be.
Cats also hiss to defend territory or resources, such as when a new cat arrives or an outdoor cat appears. Mother cats hiss to protect kittens. Redirected aggression is common too: a cat that is upset by something it cannot reach may hiss at the nearest cat or person, even one it normally gets on with.
Hissing from pain
A cat that hisses when touched in a particular spot, when picked up, or that has suddenly started hissing at familiar people may be in pain. Cornell lists osteoarthritis, dental disease, hyperthyroidism and nervous system problems among medical causes of aggression, and pain-induced aggression is a recognized category.
Book a vet visit if hissing is new, if it happens when your cat is handled, or if it comes with limping, hiding, changes in appetite or litter box habits, or reluctance to jump. Cats hide pain well, and a change in temper is often one of the first clues an owner sees.
How to respond to a hissing cat
Give the cat space and time. The ASPCA advises not to touch, reassure or punish a cat showing defensive postures. Move away calmly, avoid staring, and make sure the cat has an escape route, such as an open door or a high perch. Do not corner it, chase it or try to pick it up.
Once the cat has calmed, look at what happened just before: who was there, what changed, what noise or smell was present. Remove or reduce the trigger where you can. If two cats are hissing at each other, separate them and reintroduce them gradually over days to weeks, using food and play to build good associations.
Introducing new pets and people
Hissing during a new introduction is normal and usually fades. Keep a new cat in its own room with food, water, a litter box and hiding spots, and swap bedding so each animal gets used to the other's scent before they meet. Feed them on opposite sides of a closed door, then a baby gate, moving closer slowly.
With visitors, let your cat watch from a safe spot and approach when ready. Ask guests not to reach for the cat. If hissing between cats continues for weeks, escalates to fights, or your cat seems constantly stressed, ask your vet about a referral to a veterinary behaviorist, who can design a plan for your home.
This page is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your pet.
Common questions
Why does my cat hiss at me?
Often because it is frightened, startled or in pain, or because something else upset it and it redirected that at you. If hissing at you is new, especially when you touch or lift your cat, a vet check for pain is a good first step.
Why do kittens hiss?
Kittens hiss when frightened, often in a new home or around unfamiliar people and pets. Give them a quiet space, let them approach at their own pace and use gentle play and treats. Most kittens hiss less as they gain confidence.
Should I hiss back at my cat?
No. Hissing back can increase fear and damage trust. A frightened cat needs space and calm. Move away quietly, avoid eye contact, and let your cat settle before trying to interact again.
Why is my cat hissing at my other cat?
Common reasons are fear, territory, redirected aggression, or one cat coming back from the vet smelling unfamiliar. Separate them for a while and reintroduce slowly. If it persists or turns into fighting, talk to your vet.
Sources we checked
This guide is general information, not veterinary advice. If your pet is unwell or injured, contact your veterinarian.