...but maybe you should try him on Acacia and/or probiotics! If he's properly wormed, then it could well be GI issues.
Btw, my old dog has been on the "IBS" diet for ages - no red meat, no dairy, low-fat, etc, etc! And whenever the dogs are ill, they go straight onto the Breaking the Cycle diet. It's what the vet suggests!
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You may think this is mad...
And whenever the dogs are ill, they go straight onto the Breaking the Cycle diet. It's what the vet suggests! 
