I think I've mentioned before that Cleo has a 'problem'. She pretty much
prefers anything to her box. Her favourite spots are carpet and plastic, she
even peed in her water dish once. She was taking Amitriptyline at one time,
which helped some, but made her sleep 24 hours a day.  So she gets locked in
the Utility room at night and when we're out. This was effective for a while
and she started using her boxes again, but she slowly slipped back into her
old habits. Even with the old carpet in this room, this still got to be a
problem again.

So I decided to wall off the Utility room to make it smaller. This would
give us less area to clean and I'd read that retraining cats to litter
requires a small room. The wall is just some 2x2s covered in plastic
sheeting with a zipper glued to the plastic to give us access. This was
working real well and Cleo was 100% good for about two weeks. But then she
saw me open the zipper and go into the closed off portion of the room. The
very next night she had learned to open the zipper and was back to peeing in
her old spots. Talk about an evil genius.

PS.
She has been to the vet several times.
She is not in any pain.
She pees normally about twice a day.
Her boxes are cleaned and emptied regularly.
She does have aggression issues (people and cats), which is probably why the
Amitriptyline helped.
We believe she may have been raised outside by someone's indoor/outdoor
female. DAGS