Royal Canin Veterinary Diets Urinary SO Cat Food is a complete dietetic feed for cats. Its urine acidifying properties and its low level of magnesium make it suitable for dissolving struvite stones and reducing their recurrence. It is also formulated for the nutritional management of cats with lower urinary tract disease.Royal Canin Veterinary Diets Urinary SO Morsels in Gravy was formerly known as Royal Canin Veterinary Diets Urinary SO ChickenRoyal Canin Veterinary Diets Urinary SO Morsels in Loaf was formerly known as Royal Canin Veterinary Diets Urinary SO BeefNOT RECOMMENDED IN CASE OF: Chronic Kidney Disease (CKD), Heart disease (when sodium restriction is sought), Concurrent use of urine-acidifying medication, Growth, gestation/lactation.Key Benefits Idiopathic Cystitis has high moisture content which helps reduce the risk of recurrent idiopathic cystitis Struvite Dissolution helps dissolve struvite stones Low RSS helps lower the concentration of ions contributing to cr