Our youngest cat he came here last December, one day all of a sudden peed in a bathtub.
I thought he was confused or so. he is six months old now.
Anyway we closed a door, we usually keep it open to release humidity after a bath.
Then a few days later he used a washbasin as his litterbox.
It’s less issue as it can be cleaned easily, but something is not okay for him therefore I needed to think about cause.
He was fine until recently, using a regular cat litterboxes with other two cats.

We didn’t change a sand or its layout, keep those clean as much as possible.
What’s wrong?
We closed a washroom’s door as well.
Then, he started meowing when he wants to go to a bathroom.
I open the door, he jumps in to the washroom bowl and pee or poop.
Mom gave me a spare box. And I placed it right next to a washroom room.
He used it several times only when the door is closed, if we are there for brushing teeth, washing hands, he’ll jump in and pee or so, it’s quick and he looks like needing it immediately, really hard to stop or move him to his restroom.
The first option is a washroom, secondary is a kitchen sink, then a litterbox.
My concern is that he is holding himself until we open the door, that is not okay. He may become sick.
Thanks to Google, there are so many results for search keywords “cat” “toilet” “washbasin” “kitchen”.
It’s such a relief, there are many blogs meaning it’s not unusual, also there are advices and solutions available.
- keep water in a washbasin or make it not available somehow
- Place a cat litter at close place as an alternative
- Block a kitchen sink, somehow
- Wait and see
We used to have more than five cats and I don’t recall anything like this happened back then.
After some research I found a successful example which is to place a litter box in a restroom. Also applied a cover to make it his private restroom.
