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Urinary stones (calculi, uroliths) are common in cats.  Every fifth cat with Feline Lower Urinary Tract Disease (FLUTD) will have some type of urinary stones.  A decade ago, almost all the urinary stones were composed of magnesium-ammonium-phosphate  or MAP (~80%), known as struvite, or triple phosphate.  With a new generation of prescription acidifying diets, struvite stones occur less frequently to approximately 40% of all stones.

Unfortunately, acidifying diets (pH less than 6.3), large doses of vitamin C, and magnesium restriction predispose cats to calcium oxalate stones.  This type of calculi is the second most common type of urinary stone in cats.  The incidence of calcium oxalate stones is on the rise, close to 40% of all urinary stones.  Calcium oxalate stones cannot be dissolved with the prescribed diet, but they can be removed surgically if they create a problem.  Calcium oxalate prevention includes specially designed non-acidifying protein restricted diets that are lower in calcium and oxalate and are high in moisture.  These diets are usually designed to have the urine pH of 6.5 and higher.  Vitamin C is not recommended for cats with history of oxalate stones.  Cats that are not allowed to urinate frequently are more prone to having stones.

KittyCheck™ 1 Blood Indicator allows you to detect the presence of invisible blood in cat's urine.

KittyCheck™ 3 Diet Imbalance Monitor  alerts you when your cat's urine has low pH (high acidity urine).

If you are considering special diet for your cat, check with your veterinarian.

To learn more about prescription diets, check the following websites:

For more information about pet diet and stone formation (urolithiasis), go to the websites below:

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