FRMy cat is spraying: understanding urine marking and what helps
Urine sprayed on a wall, a door or a piece of furniture is not revenge and not a dirty habit: it is a message. Here is how to read it, and when it is urgent.
This guide is a home-care support tool. It does not replace personalized advice from your veterinarian. For any questions, contact us at 514 223-1197.
Read this first
One sign cannot wait
Straining to urinate with nothing coming out, or only a few drops? That is not spraying: it may be a urinary blockage. Go now; if we are closed, to a veterinary centre open 24/7.
Spraying, or peeing outside the box?
Urine marking is a normal way for a cat to leave a message in scent. Most often he stands with his back to a wall or a piece of furniture, tail up and quivering, and sprays a small jet that runs down toward the floor. To relieve himself, he squats instead and empties his bladder on a horizontal surface.
Not always on a wall
A cat can also mark a horizontal surface, often bags, clothes or someone's belongings, sometimes while squatting: posture alone does not settle it. Two clues point to spraying: he usually keeps urinating normally in his box, and his marks come back to the same spots, near doors, windows or on something new.
Large puddles outside the box instead? Our guide When your cat goes outside the litter box covers that. Straining to urinate with nothing, or almost nothing, coming out? That is not spraying: go now, to a 24/7 centre if we are closed.
Rule out illness first
Go now: any one of these is enough
- Straining to urinate and producing almost nothing: a few drops, a small puddle, sometimes tinged pink or red. Those drops count: they do not mean the way is clear.
- Going back and forth to the litter box, getting into position, pushing, and nothing comes out. He may cry out, or keep licking his lower belly.
- Straining, then stopping, without a real stream ever coming out. That is not an improvement.
- Limp, cold to the touch, vomiting, hiding, refusing food. In a blocked cat those signs come late: do not wait to see them.
This holds for males and females alike, even if your cat seems fine. Thinking constipation, or spraying drops, or no longer sure he is urinating? When in doubt, go. Meanwhile, give him nothing, no sedative, no painkiller, no laxative, and do not press on his belly.
Put him in his carrier and go. During our hours, let us know on the way, through a passenger or hands-free. Outside our hours, we do not run an emergency service: go straight to a veterinary centre open 24/7.
Urinating often in small amounts, licking himself a lot, or blood you can see? Call us today, or a veterinary centre open 24/7 if we are closed. Otherwise there is no need to go now, but see us without delay: the longer spraying lasts, the more it settles in. Even when everything points to behavior, your veterinarian first rules out an illness that can cause it, mimic it or make it worse: cystitis (an inflamed bladder), bladder stones, infection, kidney disease, diabetes, an overactive thyroid.
Stress and the bladder
Stress can trigger cystitis, and it makes spraying worse: after the exam, the same changes at home help both. An older cat who starts spraying needs an exam.
Why he sprays
A cat who sprays indoors is often reacting to a trigger, something that threatens or unsettles him:
- Other cats: tension at home, or a neighborhood cat seen through the window.
- A change: a new animal, a baby, someone leaving, renovations, new furniture, a new schedule.
- A move: a whole territory to rebuild, as on Moving Day, July 1.
- Resources to compete for: one litter box or one bowl for several cats.
Neutered, and still spraying
Spaying or neutering reduces spraying, without preventing it in every cat, males and females alike. A neutered male whose urine smells strongly of tomcat, or a spayed female who seems to be in heat? Your veterinarian can check that no testicle or ovarian tissue was left behind.
At home: what helps
The goal: for him to feel safe enough that he no longer needs to mark.
- Resources for each cat: litter boxes, water never rationed, food, scratching posts, hiding spots and high perches, in several rooms, so no cat has to pass a rival.
- Hide the outdoors: first marks at windows or outside doors? Cover the bottom of the window he watches from (frosted film, a blind) and wash the outside of sprayed doors.
- Clean the whole mark: quickly, wider than the stain, down to the baseboard, with an enzymatic cleaner made for pet urine; never ammonia, vinegar or bleach. Follow the method in our litter box guide; for a wall or an outlet, see the frequently asked questions.
- The marked spot: for a while, block access to it; tie up a sprayed curtain, put away bags, shoes and clothes.
- A routine: daily play, predictable days, gradual changes.
Never punish
Shouting, squirting him with water, shaking a can of coins, "rubbing his nose in it": he only learns to stop marking in front of you, and his fear feeds the marking. Your frustration is understandable: tell us about it at the visit.
Give no home medications
Faced with a cat who sprays, it is tempting to "calm him down". Cats are a species apart: their liver does not detoxify like ours, or like a dog's, and several utterly ordinary products kill them.
Acetaminophen (Tylenol)
Fatal to cats, even a single tablet. There is no safe dose. If your cat swallowed any, it is an immediate emergency.
Ibuprofen (Advil), naproxen (Aleve), aspirin
Toxic: digestive ulcers, kidney damage. Never a human anti-inflammatory, for any reason, and least of all to "calm" a cat who sprays.
Dog flea products
Several contain permethrin, a violent poison for cats (tremors, seizures). Never a "for dogs" product on a cat, even a small amount, and watch the cat who rubs against a freshly treated dog.
Your sedatives, your sleeping pills, an antihistamine "to calm him"
Never. A human dose does not fit a cat, some sedatives can destroy a cat's liver, and several make him agitated instead of calm.
Essential oils and scented "calming" products
In a diffuser, a spray or on the coat, several are toxic to cats (tea tree, citrus, mint, eucalyptus, pine), and a deterrent may contain them.
If you think he is anxious
Do not calm him yourself: talk to us. Give him no leftover prescription, no other animal's medication and no cannabis product. Did he swallow or lick a product? Do not make him vomit: call us, or a veterinary centre open 24/7 if we are closed.
At the visit, and the log to bring
We start with an exam and a urinalysis, run here, in our own laboratory; in an older cat, often bloodwork too. In a cat who is not spayed or neutered, that surgery comes first; in Montreal, it is required after 6 months, unless an exemption applies (see what Montreal requires). Then we look for the trigger and build a plan.
Your veterinarian may also suggest a prescription medication: alongside the changes at home, never instead of them. Its full effect often takes weeks; never stop it without your veterinarian's advice: an abrupt stop often brings the spraying back.
What to expect
Fewer marks is already a success; a complete stop, if it comes, takes longer, and a returning trigger can restart the spraying.
The log to bring
Book a visit without waiting; until then, note every mark and film the posture if possible: it is what helps us find the cause.
Book a visit, and bring your log.
Book an appointment (opens in a new tab)The spraying log
One page to fill in by hand and bring to the visit. Nothing is stored in your browser.
Spraying log · Cat: ______ · from ____ to ____
Hôpital Vétérinaire Métro Iberville · montreal.vet
Straining to urinate with nothing coming out, or only a few drops? Go now. Urinating often in small amounts, or blood? Call us today. Closed? A veterinary centre open 24/7.
| Date and time | Spot and surface | Amount | Posture seen? (standing, squatting, not seen) | Which cat? (seen or guessed) | Cats present | Just before (visitor, cat outside, noise, new object, fight) | Cleaned with |
|---|---|---|---|---|---|---|---|
- Litter box this week (clumps, color)
- What changed
- Total this week
On the back: sketch your home, mark the litter boxes, bowls and windows, then number each mark.
Frequently asked questions
He is neutered (or she is spayed): why is he still spraying?
He gets into position but nothing comes out, or there is blood: is that spraying?
Is he doing it out of spite? Should I punish him?
How do I get the smell off a wall, a baseboard or furniture?
Can I give him something to calm him down?
I have tried everything. Can this get better, or should I rehome him?
Also worth reading
A message to decode
Your cat is not holding a grudge: something is bothering him. Rule out an illness, look for the trigger, clean thoroughly, never punish; we build the rest with you.
Updated October 16, 2026
Still spraying?
Book a visit and bring your log. If he strains to urinate and produces almost nothing, go now; outside our hours, to a veterinary centre open 24/7.