Walmart has several types of Beneful dog food in bags that are in different sizes depending on how much you need. At times, you can find coupons that will allow you to save money on Beneful dog food at Walmart. The store does offer roll back prices if there are new brands coming out or if the store needs to make room on the shelves for new inventory. Wet and dry foods are an option for consumers who shop at Walmart. Wet dog food options come in small containers with lids on them so that they can be stored for later use.