A friend's cat is going to live with me for the next few weeks while my friend is out of town. This cat is used to using the bathroom in showers, which her usual owner simply cleans out regularly. This has been the cat's routine for years.
However, I only have one shower, and the thought of cleaning out the cat's refuse and then stepping into the shower afterwards is uncomfortable to me. So I bought the cat a litterbox. How can I convince the cat to use the litterbox while she's staying with me?
I know I can't force her to use the litterbox, so I don't plan on punishing or getting angry with her if she doesn't do what I want. And I understand that she might be more determined to keep her habits than I am to retrain her, so if I can't convince her, I'll accept the status quo. I'm looking for the approach that gives me the best chances of retraining her without causing her any pain or discomfort along the way.
The cat is 15 years old and in good health. She's very friendly. I've only seen her a couple of times, but we got along very well, so aside from this one issue, I expect we're going to be completely happy with each other's company.