Royal Canin Urinary SO Dry for Dogs is a complete and balanced diet to assist the nutritional management of the following indications Dogs with or at risk of developing canine lower urinary tract disease To help dissolve pure struvite uroliths To help prevent struvite urolithiasis To help prevent calcium oxalate urolithiasis To help prevent calcium phosphate brushite urolithiasis This diet promotes a urinary environment unfavorable to the development of both struvite and calcium oxalate crystals Promotes the production of urine metastable RSS 5 for calcium oxalate prevention Increased sodium chloride content to increase thirst and promote formation of a dilute urine Restricted magnesium levels Controlled levels of calcium and oxalateOther products from PetCareRx