That is a common attitude. Many years ago a close friend had his grandmother living on the ground floor granny suite of a town house and every time we called round en route to the Pub the little rat yelped and would bite.

I was wearing shorts one evening and it didn't nip but actually sunk its teeth well and truly into my shin . It was dropped kicked across the hall, and the old hag screamed at me despite me standing in a pool of blood ( 5 stitches later too). She called the Police and the RSPCA. Her solution? Tell your friends not to come to the door.