Yes it does resemble an horn of some kind, rather than a tooth. of course horns can be lost in the fight for survival, as well as teeth. (I should know-all mine are gone, but not from fighting!)
Another point is how many animals could have torn this deer? They in the article imply only one powerful beast-why not more than one? Or different ones in different places? In the wild animals are drug by predators to their lairs, etc.
This thing stinks of an hoax IMO, but I am not going to judge by the flimsy evidence in that film, and let's see what time flushes out in the open....Cheers!
Live in The Light and See Forever~ MD