Can I feed my dog a mixed diet of raw and prepared food?

(Q) Can you feed a mixed diet of commercial raw food and prepared food? I am convinced by the arguments of raw food as a good diet, and would like to include it. However, I like to keep some of my dog's dinner as training treats, and, in any case, I prefer the non-messiness of prepared diets. I have heard that the enzymes for the digestion of raw and prepared foods are different, so they should not be mixed.

(A) Vet John Burns says: There is a school of thought in human nutrition that you should not eat different food types, such as protein and carbohydrate, at the same time, but I don't subscribe to that theory.

You can feed a combination of raw food and prepared food if you wish. How digestible this will be will depend on the make-up of the commercial food. Many prepared foods contain unsuitable ingredients; in my experience, a high-quality prepared food using wholegrains such as brown rice will deliver similar health benefits to those claimed for a raw diet but without the messiness.