I would definatley try a better food for optimum health and immune system. We added a recommended dog food page with our top five choices with much research with lindathedogsmaid. You can see the article on the EBN news page: English Bulldog Community News - English Bulldog News-The Front Page
Royal canin is NOT the best choice for optimum health and immune system.
If you don't like these foods, the nice thing is you can always go back, right?