Food cost is nothing compared to the time investment with a GSD. And honestly, I spend way more on training and equipment and vetting than I do on food. If you have to budget food costs, don't get any dog, much less a GSD.
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Amy and the dogs,
Jack - male GSD b. 8/9/10
Lillian - female Weimaraner b. ~2005
RIP Mattie - female GSD 10/18/02 - 7/24/2013