I agree it had to be a mix breed of wolf or wild dog pack. I was a rancher in Mo years ago. When I first encountered them they would let you drive by them and not move. Once they got a calf or two and we started shooting them they disappeared. Full breed are small. They are tough too. My counterpart shot the front leg off of one at the shoulder and a few months later we saw him with the pack. They are survivors and I don’t think they would normally attack something her size unless they were extremely hungry or they were hybrids. We had more trouble with wild dog packs. They are kind of like cockroaches You won’t stop them. I am now in NC and 10 years ago they weren’t here. Now they are!
Not only are they here in NC, they are doing quite well.
My dad has a friend who is a state wildlife biologist. He says that they are in all 100 counties!