How to remove dog urine smell from carpet

The short answer

Blot up as much fresh urine as you can with clean, dry white cloths or kitchen roll — press, don't rub. Before adding anything, check what the carpet is made from and its care guidance, and test on a hidden area first. If you use a product made for pet urine, choose one compatible with the fibre (for wool, one approved for wool), apply it to a cloth rather than pouring it on, and follow its instructions, including any rinsing. Use as little moisture as possible, blot as dry as you can, and judge the mark and smell only once the carpet is completely dry. Never use ammonia or bleach on urine.

Before you start

What the carpet is made from — wool, a wool blend, polypropylene, nylon or something else — and the maker's care guidance, if you have it
Whether the urine is still wet or has dried, and roughly how far it has spread
Whether anything has already been used on it, and what
A hidden area of carpet to test anything on first, checking for colour change once it's dry
Clean white cloths or kitchen roll, and gloves if you have them

On 23 September 2026 we read WoolSafe's wool carpet care guide, Cormar's carpet-care and wool stain guidance, the US Carpet and Rug Institute's bulletin on pet urine and its Seal of Approval programme, the RSPCA's toilet-training guidance and an RSPCA branch house-training leaflet, veterinary behaviour guidance on house soiling reproduced by a UK vet practice, and UK public-health guidance on urine spills. WoolSafe approves cleaning products and Cormar sells carpet, so treat their advice as maker-side guidance. We haven't physically tested any carpet, product or method ourselves.

What to do while the urine is fresh

Blot up as much as you canPress clean, dry white cloths or kitchen roll onto the wet area, using a fresh part each time, until little more comes up.
Work from the edge inwards — don't rubRubbing spreads urine further through the pile and can damage it. Press and lift instead, working from the outside of the patch towards the centre.
Check the carpet and its care guidanceWhat's safe depends on the fibre. If the carpet is wool, or you're not sure what it is, read the wool section below before adding anything.
Test on a hidden areaTry anything you plan to use on an inconspicuous patch first, and check for colour change once it has dried.
If you use a product, use it sparinglyChoose one made for pet urine that suits your carpet's fibre. Apply it to a damp white cloth and blot, rather than pouring it on, and follow its instructions for how long to leave it and how to remove it.
Blot out what's leftWhere the product's instructions or your carpet's guidance call for it, blot with a cloth lightly dampened with clean water to lift residue. Don't pour water onto the carpet.
Blot dry and let it dry fullyPress dry cloths onto the area to take up as much moisture as you can, gently align the pile, give the room some airflow, and keep off the area until it's dry.
Reassess once completely dryJudge the mark and the smell only when the carpet is fully dry. If nothing has improved, see When to stop below rather than repeating the same treatment.

If the urine has dried or the mark is old

Dried or old urine is harder to deal with. The US Carpet and Rug Institute (CRI) notes that urine can affect carpet dyes, sometimes straight away and sometimes weeks or months later, and that once a mark has been there a long time the dyes and fibres may already be permanently damaged. A colour change isn't always dirt that more cleaning will lift, and some urine marks can't be removed.

Check how far the mark goes first — an ultraviolet (UV) torch can help show old marks, though it's a guide rather than proof. Then treat it cautiously, as for a fresh accident: a compatible product on a cloth, never soaking the carpet.

Urine that has soaked in may have reached the backing or the underlay beneath. That's possible, but neither a mark nor a smell can confirm it. The CRI also warns that moisture can weaken the bond between a carpet's layers, which is one reason not to keep repeating wet treatments that aren't working.

For old urine on wool, WoolSafe says it may need treatment by a professional cleaner.

If you're not sure what caused an old mark, or it has already been treated, our guide on how to remove old stains from carpet covers that situation.

Wool and other carpet types

Wool

WoolSafe's and Cormar's guidance for urine on wool is to blot up as much as possible, apply a WoolSafe Approved pet stain remover to a damp white cloth and blot, blot again with clean water to remove residue, then dry the area and align the pile. WoolSafe adds that cleaning products for wool should have low alkalinity and no added bleach, and that damage in wet cleaning usually comes from over-wetting, too much agitation and unsuitable chemicals.

Stick to a product approved for wool rather than household laundry products such as biological washing powder, which some pet-care guidance suggests. For old urine on wool, WoolSafe says it may need treatment by a professional cleaner.

Synthetic carpets

Makers' guidance varies. Cormar, for example, allows a diluted bleach solution on its own polypropylene carpets for general stains — but that's one maker's range, and it isn't a method for urine. Don't assume a product, or bleach tolerance, carries over from one carpet to another: check your own carpet's guidance and patch-test first.

Rugs

Follow the rug's own label. Natural-fibre, antique, handmade or delicate rugs, or any rug you can't identify, are better assessed by a professional before you treat them.

What can you safely use?

Pet-urine products and biological washing powder. Animal-welfare guidance recommends cleaning accidents so the smell doesn't draw the dog back: the RSPCA's toilet-training advice suggests a biological washing powder solution, rinsed with water, and an RSPCA branch leaflet an enzymatic cleaner. Some individual products carry independent approval — the CRI's Seal of Approval tests specific products for pet stain and odour removal, and WoolSafe approves specific products for wool — but that applies to the product, not the category. We can't say pet-urine or enzyme cleaners work as a group, and none can guarantee complete removal.

Whatever you use must suit your carpet's fibre and care guidance — for wool, WoolSafe and Cormar specify a WoolSafe Approved pet stain remover. Test it on a hidden area first, and follow its instructions on how long to leave it and whether and how to rinse it out.

Mild detergent. The CRI's guidance for pet urine describes a mild detergent solution, while wool guidance uses approved products instead and warns that alkaline or sticky residues can damage wool or make it soil faster. We don't give a mixture, and it isn't a method for wool.

Vinegar, bicarbonate of soda, hydrogen peroxide, alcohol or surgical spirit, and essential oils. All appear in online advice; we don't recommend any of them as a general carpet method, and fragrance only masks a smell.

Never use ammonia or bleach. The RSPCA branch leaflet warns that the smell of ammonia may encourage a dog to go there again. NHS Scotland's guidance for care settings says not to use chlorine-releasing disinfectants on urine spillages, and GOV.UK guidance for schools and childcare says some chlorine disinfectants can't be used on urine — institutional advice, not carpet instructions, but a clear reason not to put bleach on a urine mark at home. Don't mix cleaning products.

Why can the smell come back?

A smell can come back once the carpet has dried for several reasons. Residue may remain in the fibres: the CRI notes that odour is a particular problem with cat urine, which is unlikely to stop smelling unless the urine itself is completely removed, and that some products only mask the odour, which may return in humid weather. Urine may have travelled below the visible surface, moisture may still be held in the carpet, a pet may have marked the same spot again, a product may have masked the smell rather than removed its cause, or an older, unrelated smell may have become noticeable once the carpet was wet.

A smell alone doesn't prove the urine reached the underlay. Check the simpler explanations first, let the carpet dry fully, and don't cover the smell with fragrance. Complete removal of a smell can't be guaranteed.

If the smell appeared or got worse after cleaning, our guide on why a carpet can smell after cleaning covers how to work out the cause before you try again.

If it's cat urine

The same cautious sequence applies to cat urine, but the CRI singles out its odour as particularly hard to remove completely. Cats may also spray or mark, and veterinary guidance on house soiling suggests asking your vet for help with whatever is causing it, as well as cleaning.

If accidents keep happening

Accidents are normal while a dog is being house-trained, and the RSPCA advises never punishing a dog for one. It also notes that dogs can toilet indoors for different reasons, including health, and advises asking your vet if you're concerned. This guide covers cleaning only, not health or behaviour advice.

Do you need a machine?

Not as a default. A single fresh accident that responds to blotting and a compatible treatment usually doesn't need one.

A carpet cleaner or spot cleaner may be worth considering for repeated accidents, a larger area or a smell that keeps coming back — but only if your carpet's guidance allows wet cleaning, the machine is suitable for carpet, and you can control how much water goes in. These machines add liquid as well as removing it: WoolSafe links damage in wet cleaning mainly to over-wetting, too much agitation and unsuitable chemicals, and the CRI's testing of carpet-cleaning machines includes how much water they leave behind.

Steam isn't a default either. Many pet-care sources advise against steam or other heat before urine has been treated. We found no carpet-industry evidence either way, so we'd avoid it rather than suggest it helps.

If you're weighing up machine types, carpet cleaner vs spot cleaner explains how they differ.

Mistakes to avoid

Rubbing instead of blotting. It spreads urine through the pile and can damage the fibres.
Soaking the carpet. Extra water can carry urine further in, is slow to dry, and can weaken the carpet's backing.
Ignoring what the carpet is made from. Products and methods that suit one fibre can damage another, so check what the carpet is made from first.
Using ammonia or bleach. Ammonia's smell may draw a dog back to the spot, and chlorine bleach isn't a urine treatment.
Mixing cleaning products. Combining products can be unsafe and makes it impossible to tell what's affecting the carpet.
Assuming more product cleans better. Use what the label says. Extra product adds moisture and residue without guaranteeing a better result.
Repeating a wet treatment that isn't working. Each round adds moisture. If careful attempts haven't helped, stop and reassess.
Treating a colour change as dirt. Urine can damage carpet dyes, and that kind of mark may not respond to cleaning at all.

When to stop

Stop, or pause and reassess, if:

Colour is coming off onto your cloth, or the carpet's colour is changing.
The pile or texture starts to change.
The carpet is getting wetter with each attempt, rather than drier.
A ring appears, or the mark seems to be spreading.
The backing or a seam seems to be lifting or separating.
You don't know what the carpet is made from, or its guidance rules out what you were about to try.
The urine is old and the carpet is wool.
Careful, repeated attempts aren't improving the mark or the smell.
The smell keeps returning once the carpet is fully dry.

Judge the result once the carpet is completely dry. Complete removal of a mark or a smell can't be guaranteed, and another round isn't automatically the next step.

A professional carpet cleaner is a reasonable next step for old urine on wool, a large or repeatedly soiled area, a smell that keeps returning, or a carpet you can't identify. In some cases badly affected carpet or underlay may need replacing, and a professional can advise on that. We can't say a professional will always get a better result.

If the accident was on a sofa or a bed, see how to get urine out of a sofa or how to get urine out of a mattress. If it's vomit rather than urine, how to clean vomit from carpet covers it, whether it came from a person or a pet. For hair, see getting pet hair out of carpet. You can also browse the Pets section →