[Susan]

Hi, the vet would of tested him for Exocrine Pancreatic Insufficiency (EPI).. German Shepherds are known to get EPI, SIBO, IBD.. the Vet prescription diet Hills I/d Gastro has Crude Fiber-2.6% Dietary Fiber-7.3% Soluble Fiber-1.2% Insoluble Fiber-6.7% Fat-13.9% what you can do is email companies & ask what their Soluble & Insoluble fiber % is as they don’t normally put these % on the kibbles packaging..& try to find a kibble that is as close in insoluble% & soluble% fibers to the Hills I/d Gastro…..
Kibbles that are healthy weight diets normally have more insoluble fiber, so you could try a few healthy weight diets & see how he goes (limited ingredient diets) Wellness Simple has one its Salmon & Peas.. I’d stay away from peas when dog has bowel problems ….it may be hard to find another diet like the Hills I/d Gastro vet diet as its made specially for Gastrointestinal health problems like IBD IBS EPI.. another thing you could do is join a Face Book group called “EPI-Exocrine Pancreatic Insufficiency in dogs” group & ask the people in the group what diet are they feeding their dogs, even though he tested negative to EPI some dog will still have some of the symptoms to EPI…needing a lower fiber diet.. there’s a few people with German Shepherd in the group they my be able to help more as they know the breed….