n large animal 

Perception +9; low-light vision, scent (imprecise) 30 feet

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

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

AC  19; Fort +10, Ref +8, Will +7

HP 45

Speed 40 feet

Melee [>] jaws +12, Damage 1d10+5 piercing plus Knockdown and bonecrunching bite

Bonecrunching Bite A creature that is critically hit by a hyaenodon must succeed at a DC 20 Fortitude save or become wounded 1 as the creature's bones or cartilage are crushed by the beast's jaws.

Drag [>] The hyena makes a jaws Strike against a prone enemy. If it hits, in addition to dealing damage, the hyena Strides up to 10 feet, dragging the enemy along.

Pack Attack The hyaenodon deals an extra 1d6 damage to any creature within reach of at least two of the hyaenodon's allies.

Bestiary, page 211.