le large beast fiend fire 

Perception +19; darkvision, scent (imprecise) 120 feet

Languages Infernal (Can't Speak Any Language)

Skills Acrobatics +18, Athletics +19, Stealth +18, Survival +20 (+22 to Track)

Str +6 Dex +5 Con +5 Int -2 Wis +4 Cha -2

AC  28; Fort +21, Ref +19, Will +16

HP 150; Immunities fire; Weaknesses cold 10

Hellish Revenge [R] Trigger The Nessian warhound is critically hit by any Strike. Effect The Nessian warhound's Breath Weapon recharges. It can immediately use it as part of this reaction.

Speed 40 feet

Melee [>] jaws +21 (magical), Damage 2d8+6 piercing plus 1d6 evil and 2d6 fire

Breath Weapon [>] (divine, evocation, fire) The warhound breathes flames that deal 10d6 fire damage to all creatures in a 15-foot cone (DC 28 basic Reflex save.) The warhound can't use Breath Weapon again for 1d4 rounds. If the Nessian warhound would take fire damage or be targeted by a fire effect, its Breath Weapon recharges.

Bestiary, page 205.