Keen Hearing and Smell. The hound has advantage on Wisdom (Perception) checks that rely on hearing or smell.
Pack Tactics. The hound has advantage on an attack roll against a creature if at least one of the hound's allies is within 5 feet of the creature and the ally isn't incapacitated.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit:7 (1d8 + 3) piercing damage plus 7 (2d6) fire damage.
Fire Breath (Recharge 5–6). The hound exhales fire in a 15-foot cone. Each creature in that area must make a DC 12 Dexterity saving throw, taking 21 (6d6) fire damage on a failed save, or half as much damage on a successful one.
Monstrous, fire-breathing fiends that take the form of powerful dogs, hell hounds are found on the battlefields of Acheron and throughout the Lower Planes. On the Material Plane, hell hounds are most commonly seen in service to devils, fire giants, and other evil creatures that use them as guard animals and companions.