Constant hunger is a sign of megacolon as they can not properly absorb the nutrients in the food. MC is pretty unmistakeable as it looks like they swallowed a ping pong ball whole. The belly feels like it's filled with air with very little give when poked.
It sure does sound like MC to me. Maybe put him on paper towel to see if he is pooping. If he isn't, I would think MC.
I am sorry. It's always hard to see.
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