Why does my cat hiss?

3 min read Updated on October 8, 2026

In shortA cat hisses or spits to say “back off”: it is a defensive warning, most often driven by fear, not an attack. He is warning you before he scratches or bites, and that warning is valuable. The usual triggers: an animal or a person getting too close, a corner where he feels trapped, an unfamiliar smell, or a hand on a sore spot. Step back, look for the cause, and never punish him.

What it often means

Fear: a dog, a child, a stranger or another cat gets too close, and he cannot or will not run away.
Pain: he hisses when he is picked up or touched in one particular spot, when he never used to.
An unfamiliar smell: the other cat coming back from the vet, your clothes after you petted another animal.
Overflowing tension: after spotting a cat outside, he hisses at whoever walks by first, even a usual companion.
Play that went too far, or a mother protecting her kittens: the hiss draws a line not to cross.

Signals to read at the same time

The ears: turned sideways or flattened back, they confirm fear and self-defense.
The body: crouched, weight on the hind legs, ready to flee; or an arched back and a puffed tail to look bigger.
The mouth: lips pulled back, teeth showing; a short spit, sometimes with a paw slapping the floor, says a swipe is close.
The exit: if he has a way out, he will leave; trapped under furniture or in a corner, he may defend himself.
The context: who or what is facing him, where your hands are, what happened just before.

What you can do

Step back right away and look away: you are giving him exactly what he asked for, so he has no need to go further.
Never punish him, yell or hiss back: you would add fear, and he might later scratch without warning.
Leave him an exit and a high hiding spot; never drag him out from under furniture.
With a new cat or a dog, go back to a distance at which he no longer hisses, and pair the other animal’s presence with treats.
Note who, what, where and how close; if he hisses when touched, film the moment to show your vet.

When to see a vet

See a vet if your cat starts hissing when he never used to, especially when he is touched, picked up or jumping: pain is a common cause, whether from joints, an abscess, teeth or the belly. In an older cat, new irritability can also come from hyperthyroidism. If the hissing continues after a normal checkup, a veterinary behaviorist or a certified behavior consultant can help you find the cause.

Frequently asked questions

My cat hisses at me. Does he hate me?

No. The hiss is about the situation, not about you: he was scared, hurting or overwhelmed. Think back to the seconds before: a reaching hand, a sudden move, a smell on you, another animal behind you. Let him come back to you later, without forcing it: trust rebuilds through short contacts he chooses.

He hisses at our other cat who just came back from the vet. Why?

The returning cat smells of the clinic, its products and stress: his companion no longer recognizes him by smell. It is common and often temporary. Keep them apart for a few hours, swap their blankets, then reunite them over a meal. If the tension lasts several days, read about cats fighting at home.

What is the difference between a hiss and a growl?

A 2020 review of the cat’s vocal repertoire lists them as two distinct sounds, each with its own contexts. The hiss is a short burst of air, mouth open, that asks you to back off. The growl, low and continuous, often goes with a more determined threat. Both together say he has reached his limit: step back.

My kitten hisses at everything. Is that normal?

In a kitten who just arrived, it is common: everything is new, and hissing is his way of keeping the world at a distance. Do not force him or grab him. Sit at his level, let him come closer, and pair your presence with treats and wand-toy play. The hissing often fades as he gains confidence.

Sources

The studies this page relies on, with a link to the original publication.

Tavernier et al. (2020). Feline vocal communication. Journal of Veterinary Science.Review of the cat’s vocal repertoire: meow, purr, trill, hiss, growl, yowl, chatter, each with its own contexts.

Mimo reads behavior. It does not replace a vet.