Royal Canin Urinary SO Moderate Calorie Dry Dog Food 7.7 lb bag Ingredients to increase urine volume and reduce the concentration of the minerals that form kidney stones Compounds that dissolve struvite urinary stones in your pet's system Ingredients that acidify your dog's urine and prevent stone buildup Omega-3 fatty acids to help your pet's urinary tract fight infection and inflammation Controlled amounts of magnesium, phosphorus, and protein to keep your dog's system running clean