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 attack rolls 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.

Crushing Jaws. The wolf may use its attack action  to do 3d8 + 2 piercing damage to a creature it has grappled. The creature has disadvantage to all saving throws made to escape a grapple if it took damage in this way this turn.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (2d4 + 2) piercing damage. If the target is a creature, it must succeed on a secondary grapple check (str) Athletics vs (dex) Acrobatics or (str) Atheltics. On a failure the target is grappled.