Dire Wolf

Family: Canines
  Large beast, unaligned
  Armor Class 14 (natural armor) Hit Points 37 (5d10 + 10) Speed 50 ft.
  STR DEX CON INT WIS CHA 17 (+3) 15 (+2) 15 (+2) 3 (-4) 12 (+1) 7 (-2) Skills Perception +3, Stealth +4 Senses: passive Perception 13 Languages – Challenge 1 (200 XP)
  Special Traits
  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. Actions
  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. About
  This immense black wolf is the size of a horse, its fangs as large and sharp as knives.