You could try adding some pumpkin for a few days...and also try only adding about 10% of the new food. I wouldn't let the looser stools continue for too long or it could turn worse and you don't want him dehydrating. If you have to go back to the old food, it's okay...you can always switch again later.
Btw, look at the ingreds of both bags....is the main protein or carb source different on the new bag? If yes, you may want to switch to the same protein in a new food. In other words, if chicken is the main meat/protein in the old food, you may want to also use that protein in the new food.
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