Remus is the reason Hogwarts limits what animals you can bring. Whenever they’re about to get caught, James, Sirius and Peter all change to their animagus forms, leaving Remus caught red-handed with a stag, a dog, and a rat. After listening to Remus sigh long-sufferingly for the eighth time, “yes Professor, that is my stag. No Professor, I don’t know why he’s got his head stuck in the bannister,” McGonagall promptly bans anything besides owls, cats, and toads.