Mrs Norris is Filch's cat. For the students, it's the "dearest ambition of many to give her a good kick". If Mrs Norris catches a student putting one toe out of line, Filch will arrive in seconds. The cat has been known to follow Hagrid everywhere when he goes up to the school, apparently under Filch's orders – which suggests an extraordinary connection between cat and owner, and makes Hagrid want to introduce her to Fang.
Individual Additional Information
Relationships
My sweet has an unspecified social relationship with Argus Filch.