Armor Class 13 (natural armor)
Hit Points 11 (2d8 + 2)
Speed 40 ft.
Skills Perception +3, Stealth +4
Senses passive Perception 13
Languages —
Challenge 1/4
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.
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 DC 11 Strength saving throw or be knocked prone.
Monster Manual (2014), p. 341