I put Jack & Jill on Nature's Variety Instinct about 7-8 months ago, when they were around 7 months old. But soon after, I got nervous about the high protein, so now I mix a little Prairie in with the Instinct. I hear from most people that high protein is not bad, but I still think that's why J & J got to be so big (not that I care - I love them just the way they are)! Also, I like mixing the two so they get some flavor variety.
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