Why grain free dog food: Benefits of grain free dog food Grain free food is recommended 1. "...for active dogs that need to draw on that excess energy." 2."... if they suffer from grain intolerance. This can often result in bloating, vomiting and other forms of stomach distress..." 3. "... for pregnant dogs and lactating dogs, to provide the energy the dam needs to produce healthy puppies and provide them with nutrients as well."