[KegRiver]

First I have seen a few predator killed livestock, and a few injured.

Second, in my experience, without seeing the kill take place, it is all guesswork.

One thing I have noticed is that members of the dog family, domestic dogs, Coyote, and Wolves tend to go for the back legs and head in the initial attack. Once the animal is down they seem to prefer to go for the stomach area.

Bears will sometimes just take a big chunk, usually from high on the back or shoulder.

Given the little information available to me in this case I would guess it was a Black Bear.