It's not uncommon to see cats hanging round restaurants in Paris, like the Oyster Cat I spotted outside the restaurant where I have sometimes done some writing. You can also find them in the cemeteries where I'm sure they get plenty to eat from the mice and rats.
And on occasion, you might even see one in the window of a shop -- even if the shop is closed. The shopkeepers have them to control the mice (it's a city and they exist; what can one do?) and to keep them company during the work day, and instead of taking them home at night, the cats can just live in the shops. I've seen them in bookstores, magazine/"Presse" shops, antique shops and various others.
I was walking past a florist the other day near République, and as I admired the rose plants (in December!) my eye was caught by something moving in the window: it was Flower Cat!
She looks quite contented, all curled up there, surveying her domain and keeping the shop free of unwanted critters. Clearly, she's well fed with her shiny coat.
Too bad my mother can't have a cat in her house, what with the recent rodent problem over there that forced us to hire an exterminator. It would also be good company for her. But my sister, who needs to be there often has been highly allergic to cats since childhood, so alas - no Jersey Cat to photograph.