We know. Why do they do it? Who knows? But don’t give up on them because they will figure it out. Until then get Cat Odor-Off. Veterinary approved odor eliminator that removes cat urine smell instantly and helps stop them from returning to the same spot. Cleans and deodorizes carpets, rugs or hardwood floor, leather, upholstery, and other surfaces. Concentrate makes up to 4 gallons. A non-enzymatic formula that is safe for pets and people.