Royal Caninâ?™s Veterinary Diet Urinary SO is a specially formulated diet for cats with or at risk of developing feline lower urinary tract disease and predisposed to weight gain. Urinary SO works to effectively dissolve pure struvite uroliths and prevent struvite urolithiasis as well as calcium oxalate urolithiasis and calcium phosphate (brushite) urolithiasis. Urinary SO will also aid in the management of idiopathic (interstitial) crystitis. Please Note: All food is shipped via ground delivery, only to the Contiguous (48) States. Please allow 7 to 10 days for your delivery to arrive. (More Info) Please Note: Royal Canin diets requires authorization. This product ships directly from Royal Canin and will arrive separately from other products ordered from EntirelyPets. This product will not be fulfilled until a copy of a valid authorization is faxed to 510-892-2930 or e-mailed to email@example.com. *Royal Canin foods cannot be returned for any reason in accordance with FDA regulations in the US . Please be sure that you are placing an order for the correct food. We cannot accept any returns on these foods.