Google Farrier and see who is in So Md, There also is a Amish Farrier but you will have to do some leg work to find him.
Maybe someone else here knows him..
You could also try the barns out by Wayne's signs, near Helen. They also have draft horses. I understood some one to say the owner of Wayne's also owns the horses.
There's a guy that's a farrier very near Stauffer's feed mill. Don't know if he's Mennonite or Amish. Ask at the feed mill or Loveville Leather. He should have old shoes.