Bandog n. A mastiff or other large and fierce dog, usually kept chained or tied up. "The keeper entered leading his bandog, a large bloodhound, tied in a leam, or band, from which he takes his name."
... sounding through the towne, mine hosts being the auncient watring place where he did use to cast anchor. You must understand he was none of those base rascally tinkers that with a bandog and a drab at their tayles and a picke staffe at their necks will take a purse sooner then stop a kettle. No this was a devout tinker, he did honor God Pan; a musicall tinker, that upon his kettle-drum could play any countrey-dance you cald for, and upon Holly-dayes had earned ... — The English Novel in the Time of Shakespeare • J. J. Jusserand