EVO Herring & Salmon Formula Dry Dog Food is grain free. By removing ALL grain from the diet, EVO minimizes starch or carbohydrate intake while maximizing the concentration of protein. In fact, EVO provides high-quality protein at a level that is among the highest available anywhere. In addition, EVO also contains a source of viable, naturally occurring microorganisms and has both linoleic acid (an omega-6 fatty acid), and combines omega-3 fatty acids, glucosamine and chondroitin sulfate to support joint health.