Hey, I like this idea, especially wolves (regular wolves would work)....a really creepy pack of hungry wolves following along in the wake of the shadow thing. Maybe someone could do a post for the wolves as they make their way towards the north intending to join up with the shadow creature but then see the Inn in their path and decide to stop and have a little "snack" first.
I don't think bringing the big shadow thing back to the Inn is a good idea. The animals would have the same problem dealing with it there as they did out in the forest and plain. The creature is just too powerful for them to make any real contribution to its defeat. I think we need a "villain" that's more their own size. You could have cooperation between the animals and the people at the Inn in order to defeat the wolves.