Hell Hound (CR 3)

Medium Outsider (Evil, Extraplanar, Fire, and Lawful)
Alignment: Always lawful evil
Initiative: +5 (+1 Dex, +4 Improved Initiative); Senses: darkvision 60 ft., scent, Listen +7, and Spot +7

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AC: 16 (+1 Dex, +5 natural), touch 11, flat-footed 15
Hit Dice: 4d8+4 (22 hp)
Fort +5, Ref +5, Will +4

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Speed: 40 ft.
Space: 5 ft./5 ft.
Base Attack +4; Grapple +5
Attack: Bite +5 melee
Full Attack: Bite +5 melee
Damage: Bite 1d8+1 plus 1d6 fire
Special Attacks: Breath weapon, fiery bite

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Abilities: Str 13, Dex 13, Con 13, Int 6, Wis 10, Cha 6
Special Qualities: immunity to fire, vulnerability to cold
Feats: Improved Initiative; Run; Track
Skills: Hide +13, Jump +12, Listen +7, Move Silently +13, Spot +7, and Survival +7*
Advancement: 5-8 HD (Medium); 9-12 HD (Large)

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Climate/Terrain: Nine Hells of Baator
Organization: Solitary, pair, or pack (5-12)
Treasure: None

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Source: Monster Manual

Breath Weapon (Su): Cone of fire, 30 feet, every 2d4 rounds; damage 1d4+1, Reflex half DC 13. The fiery breath also ignites any flammable materials within the cone, Hell hounds can use their breath weapon while biting.

Fire Subtype (Ex): Fire immunity, double damage from cold except on a successful save.

Skills: Hellhounds receive a +5 racial bonus to Hide and Move Silently checks. They also receive a +8 racial bonus to Spot checks and Survival checks when tracking by scent, due to their keen sense of smell.