I have a Shiloh shepherd with EPI and we've been using enzymes from Enzyme Diane for years very successfully. I started with the 6x powder and changed a couple of years ago to the 8x powder, which is stronger and less is required in the food. Keeva is 12 and the EPI hasn't affected her quality of life too drastically.
I did give her raw pig pancreas at one point instead of enzymes and that worked well but we did go back to the enzymes for convenience. I avoid fatty or rich foods like turkey or bone marrow, but she can tolerate a few extra treats. I would say that stress is the most detrimental thing for an EPI dog. A stressful episode like a vet visit can cause loose stool but that usually clears up within a day or so.
She does have additional autoimmune conditions, including pannus and degenerative myelopathy, and a couple of small skin tumors. Out of everything, the EPI is actually one of the least debilitating issues.
It can definitely be managed.
Caesar von Nadar (Ronan)
Jaeger, SchH 2, HIT (May 2004-June 2014)
Keeva, CGN, HIT (April 2002-Aug. 2015)
Luther (Aug. 2014-Nov. 2015)