Since I've brought my 8 month old lab pup home he's had chronic digestive issues. The minute I think he's stable he relapses and his stools become loose all over again. He's been screened for everything from EPI to Addisons and fortunately all's come back fine except for a B12 deficiency. He's currently (on Vet's direction) getting probiotics, pumpkin powder, psyllium, and B12 supplement. When he has a relapse he goes on Hills ID Digestive and metronidazole and then gets weaned off very slowly. All seems fine and then like clock work about 5 days after we end meds he gets sick again. I'm feeding Purina Pro Plan large breed puppy. I'm at a complete loss and frankly, I think my vet is beginning to feel the same way. I would so so appreciate input from someone here who's experienced something like this or had advice.