I would try him on a bland diet of Gerber Chicken Baby Meat or Turkey and see if he will eat that on his own. He definitely needs something in the tummy that will stay there. You might go to the health food store and get some slippery elm and acidolphilus powder to add to his food to help bind him up. Also, benebac or plain unflavored yogurt will put good bacteria into this gut that is necessary to process food and form stool. I would take him off of the dry food totally until this is cleared up because he needs as much moisture in him as possible to prevent dehydration and maybe add pedialyte to the mix rather than his regular water. If push comes to shove, it could be an enzyme difficiency and adding a product called Prozyme to his diet may take care of the problem all together. You can order it at www.revivalanimal.com. Other than checking all of the above, including a check for giardia and coccidia, I'm unsure what else it could be. Let me know if any of the above helps.