I think that there should be more piercing damage. Claws and teeth -- meaning most creatures -- should be piercing instead of normal.
I'm assuming they are normal because when I'm hit and take damage, I'm seeing the red rectangle off the health bar, and red seems to mean normal damage.
Yeah, when it shows red bars falling from you it's normal damage. I don't really think claws would be piercing, as they're only being raked across you. Teeth is probably debatable, as they are being sort of sticking you in a way, but it seems like they'd be too short to actually pierce anything.