I found this searching the web for info on dog diets s my son can do his speech for 4-H.  Plus we want Blitz in tip-top shape for his 4-H show in August, not that we wouldn't want him that way any way, but with added stress and work of dog classes and daily training I want to make sure he is fed right.

So any way found this and it had some good info, it tells why certain foods are good for the dogs diet.

http://www.irishacrespethealth.com/pdf/foods-add-dog-diet-1.pdf