Hill's nutritionists & veterinarians developed Prescription Diet c/d Multicare clinical nutrition specially formulated to support a cat's urinary health. In fact, c/d Multicare is clinically tested nutrition to lower the recurrence rate of the most common urinary signs by 89%. This dry food is made with chicken and has an irresistible taste that your cat will love. How it helps: Dissolves struvite stones in as little as 7 days (Average 27 days) Reduces the risk of struvite & calcium oxalate stones Lifelong feeding provides benefits for cats with urinary signs S+OXSHIELD: Formulated to promote a urinary environment that reduces the risk of developing struvite & calcium oxalate crystals How it works: Promotes desirable urine pH levels to reduce risk of stone formation Enriched with antioxidants & omega-3 fatty acids Controlled calcium, low sodium & added potassium citrate