I have IBS (Irritable Bowel Syndrome) and it is controlled by taking Metamucil every day! If I get off of it for even a few days, it is back to diarrhea after every meal! I don't know how it works exactly but the Metamucil fiber works like a charm! Sooo glad your vet (2nd) was wise enough to see this!!!

Hugs to Mishka!

Kim