 Dog food is dead and naturopathic Dr. Dennis Black wants to bring it back to life. He created Rough Greens and is also an airborne ranger and green beret. An amazing background. There are so many emails we get of people that love Rough Greens and say it's done wonders for them and their dog. Dog food is dead and Rough Greens supplements your dog's food with essential vitamins and minerals, omega oils, digestive enzymes, probiotics, and antioxidants.