That sounds very similar to what Digi has. Except we know what causes it. Shes allergic to red meat, dairy and shellfish(not sure on the shellfish, but since it does give her wet poop I avoid it just encase). We only learned of this allergy due to the fact I watch what I feed my dogs & pay attention to all signs (part of my anxiety). I ran personal tests & to see what would happen is I only fed chicken for 2 weeks, then fed beef. BAM horrific results.. Ran them a few times & came to my conclusion, some foods upset her tummy (I didn't think allergy at the time)... anyways a tiny crumb of cheese nearly killed her a couple years ago. Pepto Bismol is our savior! She hates it, but it keeps her out of the ER when she gets into something shes allergic too.