This will alienate about half the Piggs reading this, but I learned long ago to simply not rent to people with pets. Saves all sorts of problems even though it eliminates half your market and probably lowers your asking rent, and certainly your deposit.
Cat urine is worse than dog urine and the smell CANNOT be removed. A future tenant without pets and possessing a sensitive nose (IOW, the kind of tenant you want), will surely smell it and rightly complain, perhaps not upon initial showing but after moving in.
Don’t waste your time and money on carpet treatments that claim to eliminate pet urine smell. They don’t work. Furthermore, you can’t just replace the carpet–the pad must go too. And during the new installation when both are up, treat the affected area heavily with bleach and water, because the smell is in the wood and concrete too.
