Donkey of legend
Size/Type: Medium Outsider
Hit Dice: 2d8+12 (20 hp)
Initiative: +8
Speed: 30 ft. (6 squares)
Armor Class: 21 (+4 dex, +7 natural), touch 14, flat-footed 17
Base Attack/Grapple: +5/+5
Attack: Hoof +5 melee (2d6+5)
Full Attack: Bite +5 melee (1d6+5) and 2 hoofs +5 melee (2d6+5)
Space/Reach: 5 ft./5 ft.
Special Attacks: Frightful Presence
Special Qualities: Low-light vision, scent, Reflective Hide, Immune to Mind-Affecting, Immune to Poison
Saves: Fort +13, Ref +11, Will +4
Abilities: Str 20, Dex 19, Con 22, Int 4, Wis 13, Cha 6
Skills: Balance +3, Listen +3, Spot +2
Feats: Endurance, Multi-Attack, Improved Initiative
Environment: Temperate plains
Organization: Solitary
Challenge Rating: 2
Advancement: -
Level Adjustment: -
A bit basic, yes.
But technical possible, though why anyone would want to I don't know.