Oh no! That's awful. How agonizing for you, and the poor filly. The one I described above had a trailer injury from rearing up over the hay manger but not as bad as yours, just a good cut not to the bone. She is young and they heal pretty well so hope for the best. I have heard of them trying to come out the access door but never had one do it. I bet you cussed the fellow who left it open! Guess its better she did it then rather than while going down the road :roll: Add some pictures when you work it out.
"Until one has loved an animal, part of one's soul remains unawakened..."
- Anatole France