This looks nothing like an animal attack to me. It looks more like she walked too close to, or rubbed on something sharp-ish..maybe a wall with a bit of nail poking out. If it were an animal attack, the results would be far more jagged and torn. If it were, say, a big cat attack, there wouldn't be just one mark..there would be several matching marks- one for each claw, plus there would be marks elsewhere on her, because a big cat doesn't attack with just one paw...they attack with both, ferociously. You also probably would have heard the commotion, or your dogs would have, and all the animals would have been flipping out. I doubt it was a coyote..they are pretty small animals, and don;t attack the same way as a big cat. They would attack low, at the legs.