My 1.5 year old GSD female has a chronic case of soft stools for over a year now. I use to feed my dog Nutro wet and dry food but my vet recommends Science Hill I/D diet. After switching over to the Science diet I saw no difference. My GSD still has very soft stools and sometimes the stool is watery with no blood.
Earlier this month my GSD had a severe case of diarrhea. I brought my dog in to our vet because the diarrhea was constant. She had a battery of test done: Ultrasound of the abdominal, Folate B12, pancreas TLI test, X-ray of the abdomen, stool culture, complete blood count and chemical profile. The ultrasound test showed an enlarged spleen. The vet indicates that there could be bacteria buildup in the spleen. The other test came back negative.
My GSD is now on flagyl and a strict Science Hill diet. The flagyl treatment will end this month. So far she has gained 7 pounds. She is only 55 pounds and should be 65 pounds.
I would like to know if the All Natural Diet can alleviate my dogs chronic diarrhea and return her digestion back to normal.
Also is chronic diarrhea in a GSD a known ailment for this breed?

I would think it would help but I don't know if anyone would be willing to guarantee that. If she were mine, I'd start her off easy by gradually adding a little natural to her diet, ground vegetables and some raw ground meat and see what happens. I know if my dogs have any dry dog food, they immediately get gas and diarrhea. The stools with the raw food are dry and white from the bones and turn to dust when dry. I also notice they don't smell like dog food stools do. Be careful adding organ meat because too much will cause diarrhea. I have large dogs and they won't get more than two chicken livers in their meal. Yogurt is supposed to help get good bacteria back into their intestinal tract but I'm leery of feeding any dairy to a dog that has diarrhea. I usually don't feed mine any milk products except an occasional small piece of cheese.

Our dog had similiar problems and it was termed "garbage gut" but our vet. Evidently, he got into something that had a buildup of bacteria and they took up residence in his stomach and intestines. Interestingly enough, it wasn't until 4 stool samples later that the little organisims were found. We put the dog on Bactrim (basically same as your stuff) and he dog developed a huge case of chronic loose stool. Once the medication was finished it took several months for his stool to return to normal. We did replace new "good" bacteria with tabs from the health food store (no live culture yogurt as it can make stools even looser). We added very little back in the way of vegetables and fun foods. He eventually developed a normal gut, but could never handle vegs, meats or bone products again. His diet for a Lamb and Rice diet sold by our vet college in Pullman, WA. Khan lived to the ripe old age of 14 when his liver began to fail and we had him put down. I bet with the proper diet your dog will pull through wonderfully. Just keep away from treats and dairy products. Our current pup has always had somewhat loose stools and we switched him to Nature's Way, Wild Duck and Potatoe diet and within one week---NO LOOSE STOOLS. He has never seemed happier! We did try the all natural diet with our new pup and it just increased the stool problems! Just like humans, every dog is different. Good luck!