We encourage feeding your GSD a raw diet.
For excellent information on raw feeding & a quick overview click here:
The formula for feeding raw is 2-4% of a dog's body weight, a day. A 100 lb dog would need 2-4 lbs a day. They need 80% muscle, 20% organ & 20 % bone. That's it! You will have the healthiest version of your dog possible, by feeding this way!