My GSD does really great on Omas Pride raw mixes. I also supplement with vitamins, raw marrow bones and Salmon skins.
His coat is shinning, no itching, clean teeth and energy through the roof. Just had blood, urine and fecal testing done as part of Archie's annual physical and the vet said, "whatever you are doing, keep doing it, weight and muscles are outstanding, coat is beautiful and numbers are perfect".
Check out their website, they ship, but I live about 20 minutes from their plant so I just go there.
Craig