I am really glad you posted this about your Bella. My Victorian Bulldog puppy has had the exact same symptoms since I purchased him from a pet store. Diarrhea since day one, not gaining much weight, gas, rumbling in tummy, always acts like he is starving even tho he is eating between 5-7 cups of food a day, and you can see all of his ribs and every vertibrae of his spine. He has been to the vet 4 times at 6 months old, all for this problem. He has been given countless antibiotics, B12 shot, Forta Flora, dewormed, ect and now after reading your story I went today to have the blood test done for EPI and for the 1st time my vet said she thinks this is probably what he has. I wont know for sure until next week but if I had not read your post I would have probably assumed it was food allergies and that it would pass. We have tried prescription GI food, Blue Buffalo Basics, pumpkin, baked potato, chicken breasts, brown rice, yogurt, cottage cheese... and still the vet says he is 15 lbs under weight. I stay home most of the day and feed him over and over again just to try to put weight on him. All in vain. So thank you again. I am so happy for you that you found your baby's solution. Please keep your fingers crossed for ours.