“Here is nothing missing, but a cat urinated on this during a certain night. Cursed be the pesty cat that urinated over this book during the night in Deventer and because of it many others [other cats] too. And beware well not to leave open books at night where cats can come.”

https://medievalfragments.wordpress.com/2013/02/22/paws-pee-and-mice-cats-among-medieval-manuscripts/