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Hello. Sorry about the long wait.
I would probably move to intestinal biopsies at this time. That could be done surgically or via endoscopy. I prefer surgical biopsies, as the last part of the small intestine (ileum) is where I prefer to get diagnostic samples. That will tell us if it's some type of intestinal disorder. It may be IBD (inflammatory bowel disease), lymphangiectasia or some other more obscure disease.
The most likely diagnosis is IBD. This is managed with steroids (Prednisone) in dogs. We can also use other things- hypo-allergenic diet, Metronidazole, Tylan (antibiotic powder), other immuno-suppressants, ect.
I hope this helps, let me know if you have any other questions.