How do I get pet smell out of carpet?

The spot you can see is the smallest part

A single accident spreads outward and downward. Urine follows gravity and seams, so the contaminated area underneath is almost always larger than the visible mark — and on a repeated deposit it reaches the subfloor.

The odour is produced by bacteria feeding on the organic material in that deposit. That activity does not stop, which is why the smell is still there a year later.

Why it comes roaring back on a damp day

Urine is alkaline when fresh and becomes more alkaline as it dries and crystallises. Those crystals release odour whenever humidity rises, which is exactly why the smell returns on a warm wet day months after you thought you had handled it.

Perfumes and deodorisers do nothing to crystals. They have to be dissolved and physically extracted.

What actually works

UV first, in a darkened room, before any water goes down. The map the light produces is what determines the treatment plan, and cleaning first would spread and dilute the very thing you are trying to find.

Then a flood and flush. The enzyme has to go down in enough volume to reach the depth the urine reached, into the pad, or it only ever treats the top. Then as much as the machine can physically draw is pulled back out, and the enzymes work on what is left.

Enzymes are not deodorisers. They are biological agents that digest the organic material producing the odour, and that takes contact time and moisture. A light mist evaporates before it can do anything — it perfumes the room, and the smell returns with the next humid day.

The honest limit

We never guarantee a result on pet urine. When an animal has been going in the same place for years, nobody can tell from the surface how far the contamination travelled — carpet, pad, subfloor, tack strips, baseboards.

The complete fix is pulling the carpet, pulling the padding and sealing the subfloor. That is construction work and it belongs to a carpet installation or restoration company. Spiker does not do it, and will say so plainly rather than keep taking your money to try again.

If the smell is coming from the wall, carpet cleaning cannot reach it. Urine swells baseboards and wicks into sheetrock, and those have to be replaced.

What not to do in the meantime

No hot water and no steam on a fresh deposit — heat sets the protein and locks the odour in. No ammonia-based cleaner, because it smells like urine to the animal and invites a repeat. No fragrance sprayed over the top: sticky by design, nothing rinses it out, and you end up holding soil on top of a source that is still producing.