Peanut hulls are used for filler in dog foods. Corn is a major ingredient in many dog foods.
Grains take up another basic part of the packaged dog foods on the market today.
Then you throw in all the preservatives that are needed to keep the food from going stale or molding on the shelf and you have the potential to make your dogs ill. There are many sites on the internet that can help you with making an informed decision on the types of foods you should feed your animals. There are also many sites on the net that will tell you how good the commercial foods are. Brand X has the most vitamins, or Brand Z is higher in protein, or Brand Y has better nutrition. When the bagged brands of dog food are heated, the food loses its nutritional value.