Thanks everyone. So even though this deeper crack sort of thing appeared recently it could be from her standing in the pond? It has always been just this slight indent but then all of a sudden it looked like this. A scar wouldn't surprise me, she's covered in them especially on her back end.
I'm buying a rasp when I finally get around to getting to the farm store. I think she is going to be barefoot from now on since she is restricted in the work she can do. So I will need a rasp to make sure boots will stay fitting.