I don't think that's an error, if I remember correctly you first find that wolf from a white mantle and that's actually it's name, it's supposed to stick with you or lead you around after Aidan's marks or something like that if I remember correctly.
It's not an error. Snow is Master Seeker Nathaniel's pet (AKA the guy who tells you to follow the Marks of Aidan through that ice cave in Griffin's Mouth to get to Kryta).