Mastiff of Kyuss* (CR 3)

Medium Undead
Alignment: Chaotic Evil
Initiative: +2 (Dex); Senses: darkvision 60 ft., low-light vision, scent, Listen +6, and Spot +6
Languages: Abyssal

AC: 19 (+2 Dex, +7 natural), touch 12, flat-footed 17
Hit Dice: 2d12 (13 hp); DR: 5/silver
Fort +3, Ref +5, Will +2
Speed: 40 ft.
Space: 5 ft./5 ft.
Base Attack +1; Grapple +3
Attack: Melee bite +5 or worm +5 touch, Ranged worm +3 touch
Full Attack: Melee bite +5 or worm +5 touch, Ranged worm +3 touch
Damage: Bite 1d6+6 plus worm plus Kyuss' gift, worm - special
Special Attacks/Actions: Smite good 1/day (+2 damage against good foes), create spawn, fear aura (DC 13, 40-ft. radius)
Abilities: Str 19, Dex 15, Con -, Int 5, Wis 14, Cha 8
Special Qualities: fast healing 5; undead traits, Resist cold 5, fire 5; SR 7, infested skin, turn resistance +3, Favored spawn of Kyuss fiendish riding dog
Feats: Alertness; Improved Unarmed Strike; Track
Skills: Jump +10, Listen +6, Spot +6, Survival +2 (+6 when tracking by scent), and Swim +5
Advancement: -
Climate/Terrain: Any
Organization: Solitary or pack (1d6)
Treasure: None

Source: Dragon #336

An unnaturally mangy mastiff skulks forward, much of its fur and flesh having fallen away leaving gaping, diseased holes. A sickly green light streams from its empty eye sockets and strands of writhing green worms replace drool in equally copious ribbons.

Plague-spreading hunters and harbingers of the demigod of worms, mastiffs of Kyuss stalk the enemies of their master's favored servants. Tireless and riddled with deadly Kyuss worms, a single mastiff might range over hundreds of miles, inevitably striking a single target with precision or seeding its god's ruinous corruption throughout an entire offending town.

This is a sample creature derived from a Template.