Hi Kristine, are you seeing a vet Gastroenterologist specialist? & has Koji been tested for EPI & S.I.B.O & Parasites??
When a dog is having problems with the small intestine you need less fiber & Soluble fiber, problems with the Large bowel more insoluble fiber, the only kibble that worked for my boy 3 years ago was the vet diet “Eukanuba Intestinal” low Residue, it only has 1.7% crude fiber, my boy does best with foods that are Soluble fibers & not insoluble fibers foods….the Hills Z/d Ultra is high in insoluble fiber….Have you try any of the vet diets ?? just till Koji is stable…
The vet wanted Patch on the Eukanuba Intestinal for 1 year, so his bowel could rest & heal…Patch was doing 2 nice firm poos a day, but Patch still had stomach problems, bad acid reflux, vomiting, grinding his teeth, nausea, eating grass, in the end Patch had an Endoscope & biopsies done, they put the camera down into his mouth & into the stomach & if the Pylori Sphincter is open (end of stomach into the small intestine) the vet can look at the small bowel & take biopsies from the small bowel as well….. a lot of dogs have the Endoscope done instead of being cut open….my vet wanted to cut Patch open but I said NO……Patch had his Endoscope & Biopsies & has Moderate to Chronic Lymphocytic Gastritis with associated spiral bacteria infection (Helicobacter Pylori) & Inflammatory Bowel Disease…I finally got some answers… ask vet about Colonoscope & Endoscope + Biopsies instead of cutting open…..
Have you looked at “Eosinophilic Gastroenteritis” or Hypoproteniemia here’s a link,
http://www.merckvetmanual.com/mvm/digestive_system/diseases_of_the_stomach_and_intestines_in_small_animals/inflammatory_bowel_disease_in_small_animals.html
