Forli Siddur, Italy, 1383 (London, British Library, MS Add. 26968, fol. 119v).
Second Nuremberg Haggadah, Ashkenaz, 1460s
(Jerusalem, Schocken Library, MS 24087, fol. 3v)
From the Oxford Jewish Studies Library:
In some medieval miniatures of the Seder feast, feline creatures appear under the table at the feet of the celebrating family.
What do these animals do at such an occasion?
The Pesahim tractate of the Babylonian Talmud discusses at length what to do if a mouse runs into the searched house with a bread crumb in its mouth (bPes 10b). The question is if the house has to be searched again or not.
In the Second Nuremberg Haggadah, the cat itself comments on its task: “Behold, I bite the mouse, lest he eat the grain” (הנני נושך בעכבר פן יאכל את הבר). Another image on the same folio depicts a man pouring the content of a bowl into a big vessel. The caption says: “One hides the leaven and the grain, lest the mouse drag it away.” Thus it seems that cats are “invited” to catch mice which might bring in some leavened bread crumbs to the searched and already ritually clean house.
Prayer book, Italian rite, 15th century (London, British Library, MS Or. 11924, fol. 153v)
Sister Haggadah, Catalonia (Barcelona), 2nd or 3rd quarter of the 14th century
(London, British Library, MS Or. 2884, fol. 18r)