# Pet Urine and Odour in Carpet: What Cleaning Fixes | Klein's What professional carpet cleaning can and cannot do about pet urine and odour, why the pad is often the real problem, and what to do before the clean. Canonical: https://kleinscarpetclean.com/residential/pet-urine-and-odour/ Updated: 2026-09-30 Publisher: Klein's Carpet Cleaning Fresh pet accidents usually come out of carpet with prompt blotting and a professional clean. Old urine is different: once it has soaked through the carpet into the pad, and sometimes the subfloor, the smell comes from underneath, and cleaning the carpet's surface cannot reach it. Klein's Carpet Cleaning, in Waterdown, pre-treats pet areas and will tell you before starting whether a spot is surface soil or a pad problem, which may need the pad replaced. [Get a carpet cleaning quote](https://kleinscarpetclean.com/quote/) [Call 289-776-7299](tel:+12897767299) Carpet in an office, a church or a building you manage? That is the other side of the business: [commercial carpet cleaning](https://kleinscarpetclean.com/commercial/). ## What can cleaning fix, and what can it not? Pet accidents in carpet, and what each one takes SituationCan cleaning fix it?Why A fresh accident, blotted quicklyUsuallyIt stayed in the carpet fibre and never reached the pad A stain visible, little smellOften, largelyThe stain is in the fibre; some urine stains change the dye and remain as a mark Smell comes back after cleaning, or when humidNot from the surfaceUrine in the pad or subfloor; moisture reactivates the smell The same spot used for monthsRarely on its ownPad replacement, and sometimes sealing the subfloor, are usually needed This is Klein's plain summary from experience, not a manufacturer's statement. ## What should I do the moment it happens? 1. Blot, do not rub. Paper towels pressed down, changed until they come up dry. 2. Do not reach for bleach. It can take the colour out of carpet, and Transport Canada's [CANUTEC](https://tc.canada.ca/en/dangerous-goods/canutec/articles/improper-mixing-common-household-cleaning-products) warns that bleach reacts with the urea in urine to form chloramine compounds. 3. Rinse lightly with cool water and blot again. Do not use a home steam cleaner on it: the Carpet and Rug Institute's [care advice](https://carpet-rug.org/carpet-for-homes/cleaning-and-maintenance/) warns that "the heat will set the stain and the smell". 4. Note the spot so it gets pre-treated at the next professional clean. ## Why does the smell come back on humid days? Because what is left in the pad or subfloor dries into residue that gives off more odour when it takes on moisture. That is why a carpet can smell fine after cleaning and worse a few humid weeks later. It is a sign the source is under the carpet, not on it. ## How should I tell you about pet areas? List them when you [ask for a quote](https://kleinscarpetclean.com/quote/): which rooms, how old the problem is, and whether the smell returns in damp weather. That decides whether the job is a clean or a clean plus a conversation about the pad. Households with pets also belong at the short end of the cleaning schedule; see [how often to clean carpets](https://kleinscarpetclean.com/guides/how-often-to-clean-carpets/). ## Get a free carpet cleaning quote Tell us which rooms, how many stairs, and about any pets or stains. We reply within one business day, by phone or email, and the quote is agreed before anyone starts. [Request a free quote](https://kleinscarpetclean.com/quote/) [Call 289-776-7299](tel:+12897767299) ### Tell us about pet areas - Which rooms and roughly where - How old the accidents are - Whether the smell returns when humid - Cat, dog, or both ## Everything about carpet cleaning - [Home carpet cleaning](https://kleinscarpetclean.com/residential/) The full service: how it works, what comes out, drying and preparation. - [Stair carpet cleaning](https://kleinscarpetclean.com/residential/stairs/) Why stairs wear first, and how each step is cleaned by hand. - [Carpet cleaning in Waterdown](https://kleinscarpetclean.com/carpet-cleaning/waterdown/) Home base, and the newer family homes around the village. - [Carpet cleaning in Hamilton](https://kleinscarpetclean.com/carpet-cleaning/hamilton/) Century homes, stair runners, rentals and the Mountain's finished basements. - [Carpet cleaning in Burlington](https://kleinscarpetclean.com/carpet-cleaning/burlington/) From Aldershot basements to Alton Village bedrooms and stairs. - [Carpet cleaning in Stoney Creek](https://kleinscarpetclean.com/carpet-cleaning/stoney-creek/) Below and above the escarpment, where family homes carry the most carpet. - [Steam cleaning vs dry carpet cleaning](https://kleinscarpetclean.com/guides/steam-cleaning-vs-dry-carpet-cleaning/) What the carpet makers' warranties actually require. - [How long carpet takes to dry](https://kleinscarpetclean.com/guides/how-long-does-carpet-take-to-dry/) Several hours, the 24 to 48 hour mould limit, and basements. - [Winter salt stains on carpet](https://kleinscarpetclean.com/guides/salt-stains-on-carpet/) The Carpet and Rug Institute's own salt steps, and why the mark comes back. - [Carpet, dust mites and allergies](https://kleinscarpetclean.com/guides/carpet-dust-mites-and-allergies/) What Health Canada recommends, and what cleaning can and cannot do. Last updated September 30, 2026 by Klein's Carpet Cleaning, Waterdown, Ontario.