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 ft. of the creature and the ally isn't incapacitated.
Bite.
Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: (2d6 + 3) piercing damage. If the target is a creature, it must succeed on a DC 13 Strength saving throw or be knocked prone