Caliban

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

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

Telepathic. Shares a telepathic link with it's master. Telepathy

Shapechanger. Can shape change once per long rest into a regular sized wolf or wolf puppy. To end the shape change requires an action.

Dark Camouflage. The wolf has advantage on Dexterity (Stealth) checks made to hide in shadow.

Multiattack. The wolf makes two attacks: one with its bite and one with its claws.

Claws. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) piercing damage.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) piercing damage. If the target is a creature, it must succeed on a DC 14 Strength saving throw or be knocked prone.

Acid Breath (Recharge 1-4). The wolf exhales a blast of acid in a 15-foot cone. Each creature in that area must make a DC 12 Dexterity saving throw, taking 9 (2d8) acid damage on a failed save, or half as much damage on a successful one.

 Confusion Breath: The wolf exhales a blast of gas in a 15-foot cone. Each creature in that area must make a DC 12 Wisdom saving throw or become confused as in the confusion for 1d4(1d4) rounds. Concentration required. Once every long rest.