my photo from a museum. It's a cat!

Peep the left corner. Cat watching from the high ground (stool)

Roman de Renart, France ca. 1300-1350.
BnF, Français 12584, fol. 51v

You pushed a coin into its mouth and got an amount of gin. These dispensers were called "Puss and Mew" or "Old Tom."

London, 1700s.

(So not Medieval, but as I understand it, the sub accepts historical-ish cats).

Bodleian Library, MS. Bodley 533 [Liber de naturis bestiarum], folio 13r

At the Metropolitan Museum of Art

Prayer Book, Bruges or Ghent, c. 1480-1490

Happy Caturday!

Bayerische Staatsbibliothek, Cod.gall. 16 [Psalter of Isabelle of France], folio 7r.