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

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

Teleport (Recharge 4–6). The dog magically teleports, along with any equipment it is wearing or carrying, up to 40 feet to an unoccupied space it can see. Before or after teleporting, the dog can make one bite attack.

Necro Breath (Recharge 5-6). The dog exhales fire in a 15-foot line. Each creature in that area must make a DC 13 Dexterity saving throw, taking 12 (4d6) necrotic damage on a failed save, or half as much damage on a successful one.