Homebrew
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 ft. of the creature and the ally isn't incapacitated.
Speak with Canines: The wolf can communicate with canine creatures.
Bite: Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) piercing damage. If the target is a creature, it must succeed on a DC 14 Strength saving throw or be knocked prone.
Fire Breath (Recharge 5-6): The wolf exhales a jet of fire in a 15-foot cone. Each creature in that area must make a DC 12 Dexterity saving throw, taking 18 (4d8) fire damage on a failed save, or half as much damage on a successful one.