le medium beast fiend fire 

Perception +9; darkvision, scent (imprecise) 60 feet

Languages Infernal (Can't Speak Any Language)

Skills Acrobatics +8, Athletics +9, Stealth +8, Survival +9 (+11 to Track)

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

AC  19; Fort +9, Ref +10, Will +7

HP 40; Immunities fire; Weaknesses cold 5

Speed 40 feet

Melee [>] jaws +13 (magical), Damage 1d8+4 piercing plus 1d6 evil and 1d6 fire

Breath Weapon [>] (divine, evocation, fire) The hell hound breathes flames that deal 4d6 fire damage to all creatures in a 15-foot cone (DC 19 basic Reflex save). The hell hound can't use Breath Weapon again for 1d4 rounds. If the hell hound would take fire damage or be targeted by a fire effect, its Breath Weapon recharges.

Bestiary, page 205.