Keen Hearing and Smell. The puppy has advantage on Wisdom (Perception) checks that rely on hearing and smell.

Pack Tactics. The puppy has advantage on an attack roll against a creature if at least one of the puppy’s allies is within 5 feet of the creature and the ally isn’t incapacitated.

Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) piercing damage plus 2 (1d4) fire damage.

Fire Breath (Recharge 5–6). The puppy exhales fire in a 15-foot cone. Each creature in that area must make a DC 11 Dexterity saving throw, taking 5 (2d4) fire damage on a failed save, or half as much damage on a successful one.