The bag size to keep an eye out for is the 3.5 pound bags, and the Best By Date and Production codes (located on the bottom or back of the bag) OCT 2014 31071083. UPC code is 17800 1269.
If you have the food, discontinue use. Nestlé Purina PetCare also says to discard it, but I'm not sure how one gets a refund from the store that way. For more information or to obtain the refund (!), you can call them at 1-800-473-8546, and that is a 24 hour, 7 day a week number.
From PetMD.com, symptoms of Salmonella in dogs can include lethargy, fever, dehydration, weight loss, mucus in stool, and abnormally fast heart rate, among other things. If your dog has had this food, definitely keep an eye on him or her for these symptoms. But geeze, if you see these symptoms in your dog ever at all, get thee to the vet!