Foo Creature (GEP)

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Foos have large, blunt heads with wide-set, bulging eyes. They walk on all fours and appear somewhat leonine, with thick fur and large, padded feet. Their forelegs are lionlike, while their hind legs are more like those of a dog. Distinguishable types of foos exist, the most common two being those that resemble dogs and those that resemble lions.
Foos lair on many planes, including the Ethereal (foos can become invisible, astral, and/or ethereal at will). Occasionally, cutters of good alignment convince foos to join or guard them. Apparently, foos were once petitioners that eventually gained proxy status through service to chaotic good powers; however, foos don't remember much about their past lives. No new foos have appeared in many years, but they live a long time, only aging when not engaged in good acts-an old-looking foo is a foo that's been idle. (PLANESCAPE MONSTROUS COMPENDIUM Appendix I) 
Foo Dog: AC O; MV 27; HD 7+7; THAC0 13 (11 vs. evil creatures); #AT 3; Dmg 1d4+1/1d4+1/1d12+1 (claw/claw/bite); SA Attack bonus, bark; SD Become invisible, ethereal, or astral at will; MR 45%; SZ M (3-4' long); ML elite (13); Int very (11-12); AL CG; XP 6,000.
SA-Attack bonus: Foos gain + 1 on attack rolls vs. LE foes and attack as 10-HD creatures against all evil foes. Bark: After seven consecutive rounds, bark has a 20% chance to summon 1d6 additional foo dogs.
Foo Lion: AC -1; MV 21; HD 11+1; THAC0 9 (5 vs. evil creatures); #AT 3; Dmg 2d4/2d4/2d8 (claw/claw/bite); SA Attack bonus, roar; SD Become invisible, ethereal, or astral at will; MR 55%; SZ M (7' long); ML champion (15); Int exceptional (15-16); AL CG; XP 10,000.
SA-Attack bonus: Foo lions gain + 1 to attack rolls vs. LE foes and attack as 15-HD creatures against all evil foes. Roar: After four consecutive rounds, roar has a 20% chance to summon 1d2 additional foo lions.