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Today I spoke with customer reps. at both places.  The guy from Wendys
said none of their salad dressings are on the gf list.  The man at
McDonalds said they are re-doing their food allergy list so that gluten
(and not just wheat) will be one of the allergens listed.   If anyone
knows of small packets of gf salad dressing, (other than Annie's) I'd
appreciate hearing about them.  Thanks, Lisa