I have three small dogs that aren't trained very well and After getting a very surprising estimate from chem dry by the millers the staff explained what had to be done for pet urine and that just cleaning over it with out treating it may cause further damage and how long that the bacteria can live in your carpet(4yrs)I love my dogs but I for don't want to be walking on my dogs urine for four years...after the job was complete and the following weeks later the odor and the stains my dogs left are gone..the carpet looks great I will always have them back..