Raw milk naturally contains probiotics – pasteurized milk doesn’t because the pasteurization process destroys the probiotics. I would say that as long as your dog isn’t experiencing any digestive issues that would require high doses of probiotics, feeding him raw milk on a regular basis would be plenty for keeping his gut flora in balance. I feel that for healthy dogs without digestive issues that consume foods naturally rich in probiotics on a regular basis (such as raw green tripe, kefir, raw milk, yogurt, etc.) it’s unnecessary (and kind of a waste of money) to supplement with probiotics.
