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How to remove pet urine from carpet
Absorb the mess.
Use wet towels or paper towels, layered and topped by some kind of weight, to quickly absorb fresh puddles. Run the towels under cool water, then wring them out so they're damp but not dripping.
Place them over the stain completely and put something heavy on top, like cans of food, a pair of shoes, or a book. The moisture helps soak up the urine, while the weight presses the towels down into the carpet.