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
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Foo Creature: Planescape Monstrous Compendium I