Great story so far

I think your story has good potential. You use good descriptions. I think you need to name your wolves, it gets confusing when you say the grey wolf, the dark wolf, the young wolf and the older wolf. If you gave them names you could keep your reader more engaged and it would be easier to keep track of what is happening. I like the way that you lead into a potential crisis right away. Keep writing you are doing a good job.

I like your story so far; I personally found the wording to be quite beautiful and very descriptive (I physically cringed at points where something bad happens to the characters :3).
I believe that in Chapter three, second paragraph, you used the wrong they're / their; also, Chapter 4 says "Chapter Three: A Winter Alone".
Just be careful of little mistakes like that. Other than that, I feel that this is a great story so far. I also like the fact that it shows that you did research prior to writing :).