ROYAL CANIN® Urinary S/O Dry Dog Food 7.5kg was developed to nutritionally support urinary tract and bladder health in adult dogs. It dilutes excess minerals that can cause crystals and stones by increasing the amount of urine your dog produces. This formula promotes a urinary environment unwelcoming to struvite and calcium oxalate crystals. This specialized nutrition, with a reduced level of magnesium, can help maintain your dog’s healthy urinary system. It is recommended that a veterinarian’s opinion be sought before and during the use of this product in order to determine the needs of your dog.