It seems that if your pet went to the bathroom on the concrete it would be no big deal. Just rinse it off and your concrete is fine. But concrete stains, too ,and if repeated pet accidents occur on your concrete, you'll not only have discoloration but will have remove but a pet stain odor. Pet urine and feces have odor-causing bacteria that don't go away unless removed. Remove pet stains on your concrete, thoroughly, to get rid of the smell.
Remove any pet stain substance from your concrete with a scraper. Dispose of the waste properly.
Cover the pet-stained area with a pet odor neutralizer that has enzymes. The enzymes break down the odor-causing bacteria in the pet stain and absorb them. Allow the pet odor neutralizer to sit on your concrete for five or six hours, then sweep it up with a broom and dustpan.
Mix a pet stain cleansing solution of 1 oz. of trisodium phosphate, 1 cup of warm water and 1 cup of talcum powder. Apply the paste in a thick layer over the pet stain on your concrete and allow it to dry and harden for 24 hours.
Scrape the trisodium phosphate paste off your concrete with a scraper and throw it away in a garbage can with a lid where children or pets cannot get to it. Wet a scrub brush with plain water and scrub the site of the pet stain on your concrete. Rinse thoroughly with a hose.
Sprinkling baking soda over the stain if it remains. Pour enough white vinegar on the baking soda to make a thick paste. Allow the vinegar and baking soda paste to sit on the concrete for 10 minutes.
Remove the baking soda and vinegar paste with a scraper. Scrub with a damp scrub brush, then rinse with a hose and allow your concrete to air-dry.