Oh my goodness that's neat! I love those types of dogs except I'm not very fimiliar with the shepards. I'm into rotties, dobeys, mastiffs, Great Danes, Pitts, chocolate labs, and mostly all the large breed dogs. Are your rotties stomach sensitive? Mine is and I feed her diamond brand maintenance from tractor supply and she does so well on it. I did have her on 4 health but we switched to diamond they are pretty much the same but diamond has a better formula I think.