The church grim is a guardian spirit in English and Nordic folklore that oversees the welfare of a particular Christian church, and protects the churchyard from those who would profane and commit sacrilege against it.[1] It often appears as a black dog but is known to take the form of other animals.[2][3] In modern times, when black dogs are kept as pets in churches and their attached parsonages, they are sometimes referred to as church grims despite not necessarily serving as guard dogs.[4]
Dyer
was invoked but never defined (see the help page).