my patronus is a horse and my animagus is a grim wolf I am a slytherpuff at hogwarts school of witchcraft and wizardry  grim wolf definition (kind of) from the internet - The giant, spectral dog that haunts churchyards! My dear boy, it is an omen-the worst omen-of death! ... The Grim is an omen of death, which is reputed to bring about the demise of the person who encounters it. The Grim takes the shape of a large, black, menaching, spectral dog. -