Multiattack

The hell hound makes two Bite attacks.

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 15foot cone. Each creature in that area must make a DC 13 DEX save, taking 21 (6d6) fire damage on a failed save, or half as much damage on a successful one.