Dire badger (medium animal)
with 7 levels of effective druid AC progression
+4 HD, +4 NA, +2 str, +2 dex, stuff
HD: 7d8 + 28, ~60 hp
Abilities:
Str 16, Dex 20, Con 19
Int 2, Wis 12, Cha 10
(+2 Str, +2 Dex; +1 dex at 4 HD)
Saves:
dire animals have all saves good
base: 5/5/5; F9/R10/W6
evasion, devotion (+4 will)
AC 22: 10 + 5 dex + 7 natural
(increase either via barding or via mage armor (buy a first level Pearl of Power for your arcane spell caster friend))
Feats:
Track (B)
1 free (retrain alertness)
3 free (retrain toughness)
6 free
suggestions: reckless rage, mad foam rager, armor proficiency light, martial study/martial stance, mage slayer line, power attack
BAB/grapple: +5
Attacks: 2 claws +8 (1d4+3), bite +3 (1d6+1)
reckless rage: 2 claws +11 (1d4+6), bite +6 (1d6+3)
rage+bull's str: 2 claws +13 (1d4+8), bite +8 (1d6+4)
all+Gr.M.Fang: 2 claws +14 (1d4+9), bite +9 (1d6+5)
all and haste: 3 claws +15, bite +10
all and flank: 3 claws +17, bite +12
gear:
pearl of power 1000 gp (for mage armor) or leather barding
rod of extend lesser 3000 gp (for greater magic fang)
collar of healing (MIC, 5000 gp)