Yep, it would require Obse, and 'skinned' versions of the creature meshes... 'alot' of them
. Those are the real difficulty, the rest would just be some good OBSE magic with the SetModelPath and Update3D commands. I've never seen such models. Besides, it would not be pretty. I mean, skinned hounds are gruesome enough (though they are the definitive necromancer's pet), I don't want to think what a poor skinned deer or wolf puppy would look like...
Its something that bothered me too. I also want to see the dremora's chest open as I rip his heart out (and me holding it in the air and yelling 'Kalimaaa!!!...', and squeezing the daedric blood in my mouth...)