Nature & Wildlife - 44 free documentaries about wolves.
Start with Wild Wolves: Pack Life (44 min, Nat Geo Animals), then The War Of The Wolf Packs - Part 1 (Wolf Documentary HD) (53 min, Real Wild). All 44 documentaries here are free to watch from their makers' official uploads. To read deeper, the top-rated book on wolves is Of Wolves and Men by Barry Lopez.