German shepherd diets?

Yes, dogs are omnivores. Yes, dogs do well on high meat content kibbles. If a dog is doing well on a kibble, chances are the best thing is to stick to it. Despite all the hype, you are unlikely to improve your dog's diet by switching brands. More often all you do is upset its digestion. You will see many answers here pushing this brand and that brand and often nasty comments about other brands. What you never will see is a study backing any one diet. I have searched and searched and never found any available for free to the public.