Has your dog been tested for Exocrine Pancreatic Insufficiency (EPI)?
EPI is pretty common in German Shepherds, but other dogs can get it too. Dogs with EPI lack the ability to produce the correct level of digestive enzymes and they are basically starving. It can be diagnosed with a blood test and it can be controlled with appropriate porcine digestive enzymes, diet, and sometimes antibiotics and/or B12. The kind of digestive enzymes you can buy in the store usually aren’t enough, so you need to work with your vet. Just changing the diet is also not enough.
If he has tested positive for EPI and is being treated, something needs to be adjusted in terms of enzymes, diet or medications. Every dog is a little different.
Ask your vet. Good luck!
