Keen Hearing and Smell. The wolf has advantage on Wisdom (Perception) checks that rely on tremor sense.
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.
Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 15 (2d8 + 5) piercing damage. If the target is a creature, it must succeed on a DC 15 Strength saving throw or be knocked prone.
Can Do A Multi Attack.
Frighful Presence. It exhales in a 60ft cone in front of itself. Each creature in that cone needs to make a dc 17 wisdom or be frightened for 1 minute, each creature that fails can make a save at the end of its turn.