Why cat urine smells so sharp
Urine marks contain extra chemicals for communication between cats, and to people they seem sharp. One of them is felinine, which is excreted in urine and is the precursor of the smells typical of cats. Unneutered tomcats excrete more of it.
That is why even a small mark can smell very sharp. It is usually on a vertical surface: the side of a sofa, a backrest, a bed frame. Look there too, not only on the seat.
Sources: ASPCA, Urine Marking in Cats; Miyazaki et al., Chemistry & Biology, 2006 (from the abstract); MSD Veterinary Manual. Checked 07.11.2026
What to do at once
- Blot Use a clean cloth or paper to blot gently, without rubbing.
- Cool water, very little Gently blot with a damp cloth and then a dry one; do not saturate the fabric.
- No ammonia Feline vets warn against ammonia-based cleaning products: to a cat, they smell like urine.
- Check a wider area The area of smell can be up to three times larger than the stain, so look at the area around it too.
ASPCA and MSD mention enzyme products as a way of cleaning thoroughly. If you use one, choose a product made for pet smells and test it in a hidden spot first. Do not use heat or chlorine bleach.
Sources: Feline VMA, House Soiling handout; ASPCA; MSD Veterinary Manual; University of Georgia Extension; Virginia Cooperative Extension. Checked 07.11.2026
First the cat, then the sofa
If the cause remains, the effect of cleaning is short-lived. About one cat in ten urinates outside the litter tray at some point in its life, and medical reasons have to be ruled out first. Unneutered tomcats and cats in homes with several cats do this more often.
If the cat repeatedly urinates on furniture, it is advisable to consult a vet before cleaning. The MSD Veterinary Manual writes that cleaning the soiled spots, adding more trays and other steps reduce or stop marking in some cats. Some, not all.
Sources: ASPCA, MSD Veterinary Manual. Checked 07.11.2026
Marking or an accident
| Sign | Urine marking | Urinating outside the tray |
|---|---|---|
| Place | Usually a vertical surface | Usually a horizontal surface |
| Amount | Smaller | Larger |
| What to do | Talk to a vet about behaviour and health | First rule out health reasons |
In both cases the vet is the first step, but for the furniture the difference is significant. A mark is small but very sharp, whereas a large amount on the seat can soak into the upholstery. Say in the form which of these is your case, and attach a photo from the side as well.
The limit of cleaning
International Cat Care writes that heavily soiled fabric should be thrown away if possible, because it stays attractive for marking even after cleaning. This does not apply to every stain, but it shows that cleaning has a limit. The sources give no measured limit for foam, so that can only be judged after an inspection.
Usually comes out
- A single fresh stain on fabric that allows cleaning
- A smell on the surface, if the cat's problem has been solved
May stay
- A smell from foam or the mattress core
- A spot the cat returns to again and again
- Heavily soiled fabric that may have to be replaced
Source: International Cat Care, Urine spraying in cats. Checked 07.11.2026
What to order
Cats mark vertical surfaces, so a headboard and the sides of an armchair are the places worth inspecting first. Headboard from €35.
If the cause is clear and the urine is not deep in the upholstery, order cleaning at your home. Read this first: sofa cleaning after a cat or dog. If the stain is on a mattress: cleaning urine from a mattress. What to do about a new accident: what to do about urine on a sofa or bed.
Sofa: two-seater from €35, three-seater from €45, corner from €50. Armchair from €20. Mattress: single from €30 (one side). Smell treatment is extra, from €15. The price depends on size, fabric, how dirty it is, smell and distance. The minimum order is €45: if the total is lower, you pay €45. Travel is included in Riga and up to about 15 km outside Riga; further out it is from €10.
Sources
- Marks contain extra substances that smell sharp to people; enzyme products; about 10 in 100 cats checked 7 November 2026
- Felinine; unneutered tomcats excrete more checked 7 November 2026
- Marking, vertical surfaces, medical reasons, cleaning reduces it in some cats checked 7 November 2026
- Area of smell up to three times larger; no ammonia; testing in a hidden spot checked 7 November 2026
- Heavily soiled fabric stays attractive checked 7 November 2026
- Blot, do not rub checked 7 November 2026
- Cool water, do not saturate checked 7 November 2026