Hell hound

Hell hounds are fire-breathing canines from the Lower Planes, usually found in the service of evil beings.

A hell hound resembles a large hound with rust-red or red-brown fur and red, glowing eyes. The markings, teeth, and tongue are soot black. It stands two to three feet high at the shoulder, and has a distinct odor of smoke and sulfur. The baying sounds it makes have an eerie, hollow tone that send a shiver through any who hear them.

Note: Hell hounds originally appeared in this form in the 2nd Edition Monstrous Manual for the AD&D game from TSR. Their use here is for the purposes of providing context for the campaign only.