We have two elderly cats (female) who are now 14. They are indoor cats and always have been. We have lived in our current house for 3 years.
It used to be that we'd find an outside-the-litter-box deposit rarely, either wee or poo happening only a few times a year and clearly tied to something (stress, dirty litter box).
For the last 18 months or so, the house constantly stinks of wee. It is usually one cat, but the other contributes as well. We brought them to the vet, who found no problem (other than being elderly). I hired a cat behavioural expert (recommended by the vet) who came to the house, met the cats, and made some suggestions, all of which we implemented (more litter boxes, cleaned more frequently, and on both floors, plus enzymatic cleaner). Nothing has helped.
My husband has declared an end -- it's either put the cats outside all day (which I am convinced will kill them, as they're not used to roads/traffic/outdoor animals), or give them up to a shelter (which would kill them, because who would adopt them?).
I hate the idea of my pets dying, suffering or being scared, but I also hate that my children live in a house stinking of wee, which is the first things visitors notice. I don't want my children to live in 'the cat wee house' (I definitely have bad memories of kids being terribly bullied for this when I was a kid).
Any ideas on how to stop this?