Yes, it can be dietary. Go to something you are sure he has done well on for awhile and see...
Other rule outs are an intestinal infection (i.e. giardia) and bile duct issues. Blood work and fecal tests can help rule these out. Sometimes vets will treat giardia w/o a positive result.
If your vet knows about it and isn't concerned, then I'd try the diet change.
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