Reminds me of one very warm night last summer, I went to brush my teeth before bed. I turned on the light, and Watson was curled up asleep in the sink, so I took my toothbrush down to the powder room on the first floor, only to find Mycroft curled up in that sink. I had to use the kitchen sink.
I got a new litter box, different style. Cat won't use it but it's only been half a day. When should I get concerned, and is there anything I can do to make him use it?