I would be worried about the cat falling in! When my old cat Bagpuss got to the stage of decrepitude where she couldn't always get outside in time, she always used to go on the toilet floor, so I suppose she had the right sort of idea, bless her! She had had an accident sometime in her past (she was a stray) that had left her sort of disconnected in the middle - her back legs weren't always going in the same direction as the front image and I think possibly this contributed to her continence problems - she still bossed the dogs about and I still miss her.