human
My cat stopped using the literbox and I don't know why.
gpt
Hi, can you tell me more about how your cat uses the litterbox?
human
My cat never had a problem using the litterbox. But all of the sudden, he decided to start peeing on my clothes instead.
gpt
Did anything else in the environment change for your cat at this time?  Was he sick?
human
He isn't sick. I did change to crystal litter last week, though.
Do you remember the kind of litter you were using before the crystal litter?
Do you think that the change to crystal litter might have had any negative effects on your cat’s behavior?