Hello Katie:
I am an owner of a dog diagnosed with EPI. Runny loose stools, losing weight, ravenous appetite. Before you start anything, your vet needs to do a cTLI test on your pup and test for pancreatic enzyme function. When a dog does not have a functioning pancreas, it means they are not producing the enzymes, amylase, protease, and lipase to digest carbs, proteins and fats. Your dog eats and eats and never gains weight because it cannot break down its food into nutrients and digest it. The poop is simply undigested food, thus diarrhea. Your vet will run a TLI test to test for exocrine pancreatic insuffiency as well he should run a B-12 folate test. Most dogs with EPI or limited digestion, have very low B-12 and need a shot once a month to keep the level high. If diagnosed with EPI then you will need to buy pancreatic ( pork based ) enzymes, not the cheaper plant based ones. Time is of the essence and you should get your pup into the vet for this test asap. Just my advice from someone who has been where you are and can see a lot of similarities and I only wish I had known sooner what I know today.
