Dig very deep and take as much of the root ball as you possibly can and then get it back in the ground as soon as possible and water it well and don't let it go bone dry. But don't drown it. You might as well dig it and see what it does instead of just tossing it..
Try as I might I can't get that link to open. I went out to peonies.org and couldn't find a reference either. I'm sure there is very good information there that I need know. MaVieRosie could you cut and paste or give the direct link? I be very grateful.