Death dog
From Ardrana
Death dogs are large two-headed hounds which are distinguished by their penetrating double bark. Death dogs hunt in large packs. Each head is independent, and their bite has been known to cause a rotting disease.
Note: Death dogs 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.