I agree with Broke Cowboy, whatever did it will come back. I'm leaning toward coyote too. Could it be teeth that made the gashes on the back end?
I posted a picture a while back of a coyote eating on a deer kill in front of our yard. I've since learned that this coyote has been working alone all winter, so he's a pretty strong one to take down a full grown deer single handed. (or should that be single pawed?? :wink: ) He is so bold that he followed a deer into our neighbour's yard, where it thought it would be safe in amongst the cattle, and just about had that one killed too when the neighbour's interupted him. He had it by the back of the neck, and was pulling it down. I could see a coyote like him leaving the same kind of big gashes as what got the calf.
Another neighbour thinks it's a wolf, but I think it's got a bit of dog in it. It's as big as our German Shepherd, and yellow. I'll try and get another picture of him, because he's a bold one, and we had a staring match last weekend at the end of our driveway. He was about a hundred feet away, and as cheeky as could be. Our dogs were barking at him, and he just stood there and didn't move, even when I yelled at him. When he did leave, it was just at a walk!
This coyote has yet to touch a calf. Maybe the donkeys have given him a training session. :wink: :lol: :lol: