Charlie, The destroyer of eardrums

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

Ferret nimbleness. The wolf have immunity from being grappled or restrained due to his uncanny ability to unhinge his bones to get out of any kind of restrictions to movement 

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 19 (3d8+ 5) piercing damage. If the target is a creature, it must succeed on a DC 14 Strength saving throw or be knocked prone

Shriek of death. Ranged Attack: +8 to hit, reach 30 ft.,Cone. Hit: 37 (5d10) psychic damage. If it has the ability to hear, the creature must succeed on a DC 18 Wisdom saving throw or be Deafened for 1 minute. On a successful roll they take half as much damage and are deafened for 30 seconds instead