Well, if you're a neutral summoner, then any animal you summon is either celestial or fiendish, chosen when you summon it. For a hound archon, you could probably bind one, Wish for it to be corrupted (or arrange its fall), and then summon that specific one later on, with a permissive DM.
Using 3.5 sources, there is a spell in the Spell Compendium that gives a creature the fiendish template. I think it's 8th lvl Sorc/Wiz.