Royal Canin Urinary S/O Moderate Calorie Adult Dry Dog Food is a complete dietetic feed for dogs formulated to dissolve struvite stones and reduce their recurrence through its urine acidifying properties, a low level of magnesium and a restricted level of, but high quality, protein. Its moderate calorie content makes it particularly suitable for dogs in which ideal weight is hard to maintain (neutering / overweight / low activity). Recommended for: Bacterial cystitis Dissolution of struvite uroliths Struvite and calcium oxalate urolithiasis Key benefits: Helps dissolve all types of struvite stones Moderate calorie content to help maintain ideal weight Urine dilution makes the urine less liable to form struvite and calcium oxalate stones Helps lower the concentration of ions contributing to crystal formation.