Last weekend we were on a Canine Nutrition course run by the Sheila Harper organisation, and taken by Sally Askew,Nutritionist/ holistic behaviourist. A real eye-opener, we'd highly recommend this course. We've added a couple of links if you're interested. The big message is THERE IS NO DIET / FOOD TYPE THAT WILL SUIT EVERY SINGLE DOG! And much much more. Have a look on the Sheila Harper website.