Golden_HVAC has the answer. When my wife died she left me with two small dogs "The Royal Rodents" brother and sister maltese aka Bill & Monica. They were getting on in years and Bill became incontinent. The urine smell on the kitchen tiles became unbearable even though I'd clean it every day it had gotten into the tile grout. I also had to deal with occasional accidents on the living room carpet. When Bill finally passed on I dowsed the entire kitchen floor with the enzyme and took a hand sprayer full of the enzyme to the carpet. Within a day the urine odor was completely gone. A few more applications removed the carpet stains as well. What really impressed me was when I left the house for several days with the AC turned off and returned on a humid 95 degree day expecting the worse. Instead I found no odors at all, non zero zip nada!
Maybe I should've put Bill down when he developed his problems but out of respect for my late wife's memory I just couldn't.
Steve