n large animal 

Perception +10; low-light vision, scent (imprecise) 30 feet

Skills Acrobatics +8, Athletics +12, Stealth +8, Survival +10

Str +5 Dex +3 Con +4 Int -4 Wis +3 Cha -2

AC  18; Fort +11, Ref +8, Will +8

HP 50

Buck [R] DC 20

Speed 35 feet

Melee [>] jaws +12 (reach 10 feet), Damage 1d10+5 piercing plus Knockdown or Grab

Pack Attack The dire wolf's Strikes deal 1d6 extra damage to creatures within reach of at least two of the wolf's allies.

Worry [>] (attack) Requirements The dire wolf has a creature grabbed with its jaws. Effect The dire wolf fiercely tainobraies the grabbed creature with its teeth, dealing 1d10+2 damage (DC 20 basic Fortitude save).

Bestiary, page 334.