Monster Manual
Perception +5
Stealth +4
Darkvision 60 ft.
Passive Perception 15
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 doesn’t have the Incapacitated condition.
Bite. Melee Attack Roll: +4, reach 5 ft. Hit: 5 1d6+2 Piercing damage, and the target has the Prone condition if it is Medium or smaller.