[theBCnut]

This could be a transition issue. What was he eating before and for how long? You can try adding some canned pure pumpkin to his food for a few days. Probiotics could also be helpful, as would digestive enzymes. If dogs have been on the same food for a while, their bodies adjust to eating that food, and readjusting can take time.

If you are seeing itchiness, eye or ear discharge, reddened skin, etc., then it might be a food intolerance issue.