Dungeons and Dragons 5th Edition Monster Manual pg 321
Keen Hearing and Smell. The Dire Wolf has advantage on Wisdom (Perception) Checks that rely on hearing and smell. Pack Tactics. The Dire Wolf has advantage on an attack roll against a creature if at least one of the Dire Wolf's allies are within 5 feet of the creature and the ally isn't incapacitated.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2D6+3) Piercing Damage. If the target is a creature, it must succeed on a DC 13 Strength Saving Throw or be knocked prone.