Yeah, its an ugly statistics block, but here you go!
GUARDIAN BEAST
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Large Magical Beast
Hit Dice: 7d10+21 (59 hp)
Initiative: +3 (+3 Dex)
Speed: 30 ft
AC: 17 (+3 Dex, -1 size, +5 natural)
Attacks: 4 slams +10 melee
Damage: Slam 1d8+4
Face/Reach: 5 ft by 5 ft/10 ft
Special Attacks: Jealous Protection
Special Qualities: SR 17, Bonded Items
Saves: Fort +8, Ref +8, Will +2
Abilities: Str 18, Dex 16, Con 16, Int 13, Wis 11, Cha 8
Skills: Spot, Listen
Feats: Alertness, Combat Reflexes, Multiattack(b)
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Challenge Rating: 6
Alignment: Often lawful
Jealous Protection: Whenever a creature holding one of the guardian beast’s bonded items begins his turn inside of the guardian beast’s threatened radius, it automatically provokes an attack of opportunity from the guardian beast.
Bonded Items: A guardian beast is tasked with protecting a cache of magic items, worth no more than 500 gp / hd of the guardian beast. A guardian beast is always aware of the location of its bonded items, and will begin tracking them down if stolen.