Processed foods (kibbles) are exceptionally inflammatory. This can be for 2 explanations: the ”protein” resources are processed at extremely high temperatures … and they consist of very large amounts of carbohydrates (that dogs don’t have to have). Some dogs which have anxiety or stress induced in specific circumstances (for example https://louiscpgmq.madmouseblog.com/16242957/how-much-you-need-to-expect-you-ll-pay-for-a-good-dog-pain-management