Dietary changes can often temporarily affect the way the digestive tract processes the new food....hopefully this is temporary though. The rice is definitely a potential culprit but not sure if it's a big deal or not in the long-term. (I don't have much knowledge in this domain so hopefully others will add even more info)
In terms of relieving constipation though, our cat Twiggy has this issue and both canned pumpkin as well as prune baby food helps her out. big time. (I teaspoon mixed with her soft food ) per meal is what she normally gets.
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