If you had a goblin head on your creature, you should notice it has only fireball. So I bet its magic attack. But I usually switch to dragon elf head once I reach sentinel island, as its more powerful. There will be limbs on hands part which will increase melee or magic damage to around 140% or 160%, which I cant exactly remember which already. That will boost the attack of your pet melee or magic. I dont think your own damage figure will affect your creature, as creature has own separates damage and defense.
Oh, before I forget, did you guys has this small glitches with the creature health. When you use any parts that boost creature hp, for example increase hp by 100%. When I summon the creature in full health with hp boosting part, and immediately save or quick save. Then when I do a reload using the save I just made, I will notice my creature hp bar with be left with only 50% hp, if I am using 100% hp boost. It just like all the increment through hp boost will be gone once I do a reload. This problem still exist even after the latest patch. I didnt try it yet with a fresh start character, so still not too sure if its being fix or not.
