I was starting to wonder if it wasn't some type of food allergy...Sacha's food allergy presents as vomiting and diarrhea...while you don't have the vomiting, you do have the diarrhea...
Can you try fasting for a day or so? i know it's not a solution, but if his little intestines are inflamed, then feeding him isn't helping (think of what happens if you have a stomach virus and you eat)...once you go back to food, do bland...even JUST rice for a couple of days...put some beef broth (or veggie broth) in for taste...but that will help bind him....then slowly add either chicken or ground beef...also, have you thought about turkey?
"Rumor has it, compulsion is evil."
Sacha CGC - Dumb Lab
Nisha CGC, PDC, PSA TC, PSA 1 - Crazy Malinois
Drusilla SLUT- Pet
Nemo - Dual-Purpose Narcotics
Cy TC, PSA 1, PSA 2, 2009 PSA Level 3 National Champion
Axo - Psycho Puppy
Rocky - RIP My Baby Boy