My son and his wife have two black labs. One was sick not eating at all, took her to the vet. The vet said the liver was bad and the dog only had a few days to live. I told them, STOP giving the dogs dog food.
So they started feeding them tilapia or tuna on sale, chicken etc with veggies etc people food, and leftovers. The dog started eating again and recovered. And let me tell ya they LOVED those dogs and always got the highest quality dog food. Not anymore.
You have no way of knowing where it was made and whats in it. Taste it yourselves. Let your instinct tell you if its ok for your dog to eat. In fact I read that dogs got domesticated by the north American Indians that gave them leftovers.