I had every intention in the world to do this for mine. My friend had hers trained. That cat would come into the bathroom (when I was on it) and pace.
I asked why and she said he wants to use the toilet

Anyway, I really wanted to train them. But the timing was really bad. Right when I got my boys I was taking care of my father (hospice) and it was already a three ring circus around here.

AND Snowy took to peeing all over everything. (because too many nurse visitors and he didn't like his litter) but I broke him of that in a month and now he's a very good boy.