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By its water contents, dog food can be catagorized into following types:
To make dried pellet dog food, you need to mix raw materials first. Then the mixture is fed into a machine called expander while steam or hot water is added. Under the vapor pressure, pellets are puffed like popcorn when they are outside. The pellets are allowed to dry, then sprayed with vitamins, grease or any other material that are not heat-tolerant.
Most commercial dog foods are made from materials unusable or less desirable for human consumption. They may include:
Not every pet food producer use all kinds of inferior materials. But usually they will use a couple or several kinds of them.
There are dog foods specially formulated to dogs that are allergic to wheat, corn, and/or chicken. These foods usually consist of lamb or fish meat.