Hell Hound

Medium fiend · CR 3

Armor Class 15

Hit Points 45 (7d8+14)

Speed 50 ft.

STR 17 +3

DEX 12 +1

CON 14 +2

INT 6 -2

WIS 13 +1

CHA 6 -2

Skills perception +5

Damage Immunities fire

Senses darkvision60 ft. , passive Perception 15

Languages understands Infernal but can't speak it

Traits

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 ft. of the creature and the ally isn't incapacitated.

Bite. Melee/Ranged Weapon Attack: +5 to hit.: 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). Melee/Ranged Weapon Attack: +0 to hit.: 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.