I like it! Took me a moment to realise Shan wasn't human, but it was easy and comfortably done. I can feel the cold air, and I like the pack's interaction with Sig's tribe; mutual dependancy.

My only real complaint is that it's not clear to me how the werewold transformations work; perhaps you'll get to it later, but I'm a bit confused - clearly, they can change at will, but there's also a time when they must change and... it's not a problem yet, but as the story goes on, I think you should make it clearer soon.

Also, one line looks incomplete:
He feels mildly uncomfortable, but
The forest thins quickly,

I also have another comment, but I'm asking that in a PM. Should be in your inbox in a few minutes.