Hell Hound is a Medium fiend with lawful evil alignment and Challenge Rating 3 in the 2024 SRD. This stat block includes AC 15, 58 hit points, speeds, traits, and actions.
Multiattack - The hound makes two Bite attacks.
Bite - Melee Attack Roll: +5, reach 5 ft. Hit: 7 (1d8 + 3) Piercing damage plus 3 (1d6) Fire damage.
Fire Breath - Dexterity Saving Throw: DC 12, each creature in a 15-foot Cone. Failure: 17 (5d6) Fire damage. Success: Half damage.