Royal Canin Veterinary Diet Urinary S/O Adult Dog Dry Food 7.5kgROYAL CANIN Urinary S O is specially formulated to help support dogs with urinary sensitivities such as struvite crystals and stones. This formula helps to dissolve all types of struvite stones that can form in the bladder. To help lower the concentration of ions that can contribute to crystal formation, this formula contains low RSS (relative supersaturation). This diet helps to dilute your dogs urine, making it less likely for struvite or calcium