I once owned a very sneaky tomcat. He made one of my
PCB's a place to
leave his calling card--and I didn't discover it for about a year.
By the time I got to it, the urine had corroded the copper right off
the substrate in places.
I threw it out. I don't own cats anymore.
Our priorities differ :-). My cat, fortunately, doesn't regard my classic
computers as toilets, if he did, I'd find some way of keeping said
computers well away from the cat. But no way would I get rid of said cat,
I love him (and the previous cat I had, and ...) more than any computer.
-tony