Ok Devon...I just read your other post. Did your vet ever run the blood test to confirm EPI like it was suggested? I would have the test for EPI done first to either confirm or rule it out before I would go for a biopsy. Have the vet run the Cobalamin/Folate test at the same time.
EPI test: Serum Trypsin-Like Immunoreactivity (TLI) - Texas A&M Veterinary Medicine & Biomedical Sciences
Cobalamin/Folate: Serum Cobalamin (Vitamin B12) and Folate - Texas A&M Veterinary Medicine & Biomedical Sciences
Did you go over to "epi4dogs" to get help? Where are you located, maybe someone can recommend a vet that is familiar with EPI in your area?
What are his symptoms exactly? What are you feeding him, how much, how often. What enzymes are you using and how much does he get with each meal and how do you prepare it? Has he ever been treated with Tylan for SIBO? Is he getting B12 injections?