From the Manufacturer:Why does my dog eat grass? Green food phytonutrients – Natures green miracles are what your dog or cat seeks. Wild animals as well as domestic animals rely on an intuitive sense to maintain their health and well-being.Throughout history green grasses have been known to contain vitamins, minerals and trace elements. As a supplement, grass provides an extraordinary selection of nutrients essential for life itself.Heating and processing of commercial pet food destroy many vitamins, minerals, and antioxidants your pet needs. Nu-Pet Canine Chewable Wafers contain powerful whole food phytonutrients that support your dogs health with enzymes, vitamins, minerals, and trace elements.Made in the USA.