Hot Dog sauce is thier beef based hot dog chili they use on thier hot dogs at teh resturant. Also availble in cans.
Very rich and very high in fat. A little goes a long way.
I'm still less than thrilled by the mustard idea too.
EDIT: Russ, the Packo's hot dog sauce, cryo packed Hung. sausage and pickles are all available at the Party Source over in Newport, KY. Everything else but the pizza crust is off the shelf.
This sounds so simple to recreate it hurts.