Eldriyn

In BG2, this spell uses spirsumm.2da to call one of four animals (that you mention). So that probably wouldn't work so well in a script. You're better off just mimicking the spell and creating the wolf (spirwolf.cre). If you want it to be more realistic, you could clone the spell and keep everything the same except just summon the wolf instead of calling spirsumm.eff. Then use HaveSpellRES and SpellRES to call it.

Yeah I just re-created the Summon Spirit Animal to summon 5 different levels of Spirit Wolf using Summon Creature effect. Works good. Thanks for the help.  If anybody wants to try it just put this file in your override and use my script above. Pretty awesome for soloing BG1 without having to click so much.  Can easily power level off sirens with these wolves.