Sorry for the long delay in getting this info to Chowhound as I promised a long time ago...
The Wiener Factory changed its standard dog to a natural casing Sabretts dog because their local supplier was providing them with wildly inconsistent sizes. (I can verify this, they once put two small hot dogs in my bun to make up for the size.) The polish sausages and turkey dogs are still made locally and are unchanged.
The owner claims that none of the food at Wiener Factory contains MSG, and I confirmed with Sabrett's by email that they don't put MSG in any of their hot dogs or sausages.
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