Originally Posted by DoubleTrouble

Some foods do tend to go straight through a dog - You have not said whether you have been feeding your dog on the same food since you had him, two weeks is a long while for him to have diaroha that is why I think it important that you consult your vet, who will more they likely put it down to food intolerance and prescribe a dry food - which will probably do no good.
the reason I mention Naturediet is because it is a pretty natural food - but as you have said so is the chicken and rice - which should have sorted it out.
So that brings us back to the thought that there could be some underlying reason for the problem. Again another reason to see the vet.
I am a firm believer of introducing a scoure of protien that the dog has never been subject to before - my prefered being naturelamb - not saying this is the answer but something that has worked for me, the other problem is that you do not want to be switching the foods too often as that can cause problems in itself.
Really I would initially consult the vet, are there any other signs of illness, weighloss, tiredness etc?
regards
DT