Did Dawnguard bring in some new animals? I just had to fight a Spriggan Earth Mother, I've never had to fight one of these before is it unique or what?

ya it did. one of the loading screen tips told me about chaurus hunters which did not exist before too.

Ahhh thanks I was wondering why i wouldnt of seen it before.

I had a glowing green fox attack me, whats that all about?

I think those spriggans already existed

It's controlled by A Spriggan. Nothing new.