Cat urinating in dog's basket
Our female cat of 2+ has taken to urinating in our dog's basket. The first time I presumed it was an accident but since washing the pillow (part of the basket) she has urinated again, once on the pillow and once on the side of the basket.
She and the dog are great friends and very affectionate to one another. Both pets get an enormous amount of affection from the family. The cat has her own basket which she sleeps in.
She is an indoor cat and has her own litter box, which she does use. The litter is kept clean and we have not changed the brand recently.