RhymeZone: bandog definitions

Definitions of bandog:

noun: (archaic) A dog that has been tied up; a mastiff or other kind of guard dog.
noun: (specifically) A type of large, ferocious dog, bred by crossing American pit bull terriers with Neapolitan mastiffs.
noun: (figuratively, literary) Anything that behaves like a bandog; something or someone who pursues doggedly.
noun: (obsolete, slang, cant) A bailiff or prison guard.

(Definitions from Wiktionary)