Foo creatures include foo dogs and foo lions. They are Chaotic Good celestial spirits who fight evil alongside worthy mortals.
Foo Creature from the Tome of Horrors (3e - d20)
Foo Creature: Monster Manual II (1e)
Foo Creature: Kara-Tur Monstrous Compendium
_TSR_AD%26D_2ed_Planescape_-_Monstrous_Compendium_Appendix_I.jpg "Foo Dog by Tony Diterlizzi-2602 (1994-06) TSR AD&D 2ed Planescape - Monstrous Compendium Appendix I.jpg (519 KB)")
Foo Creature: Planescape Monstrous Compendium I