All the pet food sold at the grocery store is terrible. It is made from the waste of the human food industry, the "not fit for human consumption" by products.
This is a must read:
What's Really in Pet Food? - Report by the Animal Protection Institute
Do you have a high end pet store or boutique in your area? That is the best place to buy dog food.
This link rates the different dog foods:
Dog Food Reviews - Main Index - Powered by ReviewPost