Does she act hungry? Puppies should eat as much as they want but since you are not home with her during the day that can be difficult. I like nutro max or natures choice for puppies. I don't think Iams is good for GSD. Though that was in the past. The formula may have changed since the late 80's when I was breeding. Same with Nutro and Natures Choice may have changed formulas since then. I found my pups did very well on that food. Best of luck.