German Shepherd Dog Forum:
Hope this helps someone.

I have a 10 month old GSD and she is the best dog in the entire universe. She doesn't chew, dig, or have accidents. The only problem that we had with her was a problem with diahhera and vomiting. Cocoa had diahhera all the time, and every couple of days she would vomit this yellow stuff that almost looked like urine. After speaking with another GSd owner I found out that the breed can be prone to having a sensitive stomach, and decided to switch her to an all natural dog food, and her problems all disappeared. She was on Iams. Even though your vet may recommend Iams or Eukenuba there is even better dog food for you dog (and cats) Go on the web and enter All-natural dog food into a search engine, and see what response you get. I do not sell any particular kind. I do recommend everyone researching dog food to see what is in it, you may be surprised as well as grossed out by it.