Hills c/d diet alters the pH of the urine. It is indicated for urinary conditions associated with stones and crystals. Not all crystals are stones will respond to this diet. Some breeds are predisposed to bladder stones warranting more concern about crystals, however crystals don't always have to be treated. So it depends on your situation.
There are other brands with similar formulations (Eukanuba, Royal Canin just to new a few) but cost is probably similar.
Sorry for the vague answer.
Last edited by huntingvet; 03-19-2007 at 10:37 PM.
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