It's easy to rinse a puddle of dog urine from a cement patio, but the lingering odour is not quite so easy to get rid of. The enzymes in dog urine are designed for scent-marking, making it difficult to completely remove them. It's important to clean away all traces of urine, because dogs can detect odours that humans can't, and will often eliminate in the same spot again and again until the odour is removed.
Rinse away visible urine puddles with a water hose.
Examine the patio with a black (ultraviolet) light to locate urine stains that may have occurred before. Hold the light 3 inches above the cement's surface, and look for areas that appear to glow. Choose a day that is overcast, or perform the examination at dusk.
Fill a bucket with 2 quarts of distilled white vinegar and 1 quart of water.
Clean the affected areas with a scrub brush dipped in the vinegar solution. Use a circular motion, and rinse the brush often.
Pour the remaining solution onto the cement, and scrub the entire surface well. Pay special attention to the sides and edges of the patio.
Rinse away the vinegar solution using a water hose, holding the stream of water 6 inches from the surface of the patio.
Examine the cement with the black light again. If any stubborn spots remain, treat the area with an enzymatic cleaner designed to remove pet stains.
If your dog continues to urinate on the patio, clean the cement thoroughly and apply a coat of concrete sealer to keep the odours from penetrating.