Probiotics are your friend during these kinds of transitions. Glad you are getting him transitioned though. Hopefulyl he does well on the new food.
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Chelle and the rest of the crew including, but not limited to Kita and Taiko (the shiba inu wrestle maniacs), Adi (reserved and dignified tabby cat), and all 28 reptiles www.freewebs.com/performanceshibas