I believe the Hills S/D disssolves the crystals, and three months is the maximum a cat can stay on the diet. Royal Canin S/O prevents both kinds of crystals. I went through this routine with Taranis but she's so overweight (and was when I adopted her) that I've changed her to a lower calorie Royal Canin diet. I'm hoping that the lower stress she is under now will reduce the risk of crystals forming - but we will see. It seems that a diet that combines blocking crystal formation and weight reduction isn't available yet.Originally Posted by Randi
Edited to add: Good news about Storm!
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