HELPS DISSOLVE STONES: Innovative urinary tract cat food helps dissolve pure struvite stones and helps prevent calcium oxalate stones

BLADDER HEALTH: Lowers the risk of crystal formation using RSS methodology for cat bladder health

S/O INDEX: The exclusive S/O Index creates an environment unfavorable to crystal formation in the bladder to support urinary health

HELPS PREVENT STONE REOCCURANCE: Specialized diet, with a reduced level of magnesium, helps prevent struvite stones from reoccurring

When your cat has urinary issues, easing their discomfort requires special care. But with the help of your veterinarian and Royal Canin, there’s not just hope—there can be a true difference.

This veterinary-exclusive dry cat food was developed to nutritionally support your adult cat’s urinary tract and bladder health. It increases the amount of urine your cat produces to help dilute excess minerals that can cause crystals and stones. Relative Super Saturation (RSS) methodology is used to help lower ion concentration in urine, which contributes to stone formation. This formula promotes a urinary environment unfavorable to the formation of both struvite and calcium oxalate crystals. And this specialized nutrition, with a reduced level of magnesium, helps dissolve pure struvite stones and prevent struvite stones from forming. Lower urinary tract issues may be a recurring concern for some cats. Talk to your veterinarian about keeping your cat on this urinary cat food for long-term urinary support. And ask them about the right Royal Canin wet cat food and treats to complement your cat’s diet.

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ContentBlockDailyPortion

Discover our tool that calculates the daily portion for your pet. Fill in your pet's information and you will get their daily feeding recommendation. In case of weight issues, do not hesitate to consult your vet to adapt this portion. Note that this feeding recommendation is more precise than the feeding table, therefore the values may slightly differ.

Calculate

Chicken by-product meal, brewers rice, corn, corn gluten meal, chicken fat, wheat gluten, natural flavors, wheat, salt, powdered cellulose, fish oil, potassium chloride, sodium bisulfate, calcium sulfate, sodium pyrophosphate, vegetable oil, fructooligosaccharides, choline chloride, vitamins [DL-alpha tocopherol acetate (source of vitamin E), niacin supplement, biotin, riboflavin supplement, D-calcium pantothenate, pyridoxine hydrochloride (vitamin B6), vitamin A acetate, thiamine mononitrate (vitamin B1), vitamin B12 supplement, folic acid, vitamin D3 supplement], DL-methionine, taurine, monocalcium phosphate, trace minerals [zinc proteinate, zinc oxide, manganese proteinate, ferrous sulfate, manganous oxide, copper sulfate, calcium iodate, sodium selenite, copper proteinate], marigold extract (Tagetes erecta L.), rosemary extract, preserved with mixed tocopherols and citric acid.

Calorie Content

This diet contains 3659 kilocalories of metabolizable energy (ME) per kilogram or 315 kilocalories ME per cup on an as fed basis (calculated).

Nutrient Amount
Crude Protein (min)32.5%
Crude Fat (min)13.0%
Crude Fiber (max)4.0%
Moisture (max)8.0%
Calcium (max)1.26%
Phosphorus (max)1.26%
Magnesium (max)0.1%.

Dry Feeding

Cat Weight Low Activity Medium Activity High Activity
4.4 lb (2 kg) 1/4 cup (26 g) 3/8 cup (33 g) 1/2 cup (39 g)
6.6 lb (3 kg) 3/8 cup (35 g) 1/2 cup (44 g) 5/8 cup (52 g)
8.8 lb (4 kg) 1/2 cup (43 g) 5/8 cup (53 g) 3/4 cup (64 g)
11 lb (5 kg) 5/8 cup (50 g) 3/4 cup (63 g) 7/8 cup (75 g)
13.2 lb (6 kg) 5/8 cup (57 g) 7/8 cup (71 g) 1 cup (85 g)

Mixed Feeding

Cat Weight Cans / Day Low Activity Medium Activity High Activity
4.4 lb (2 kg) 1/2 1/4 cup (16 g) 1/4 cup (24 g) 3/8 cup (30 g)
6.6 lb (3 kg) 1 1/8 cup (15 g) 1/4 cup (26 g) 3/8 cup (35 g)
8.8 lb (4 kg) 1 1/4 cup (23 g) 3/8 cup (37 g) 1/2 cup (48 g)
11 lb (5 kg) 1 3/8 cup (31 g) 1/2 cup (47 g) 3/4 cup (60 g)
13.2 lb (6 kg) 1 3/8 cup (37 g) 5/8 cup (57 g) 7/8 cup (72 g)
Urinary SO Dry Cat Food

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Customer reviews

John in NY
30 Sep 2021

Helps my male cats

So far has kept my male cats out of the vet's office with urinary issues. My only complaint is that the feeding guide only goes up to 13.2 pounds. My cat is a little over 20. A large cat, yes overweight, but large. How much should I feed? The need to go higher on the feeding guide!
Cheezb
28 Sep 2021

Vomiting

Yep. My vet prescribed this for my kitty so I have fed it to both. They are both vomiting multiple times a day. I’m scared to feed him anything else but I’m going to try some other over the counter foods. Was there a bad lot of these? I think they did okay with the 1st bag I bought and it looked different.
Little red baron
28 Sep 2021

Percy has had all her shots. She has been on Urinary SO for over 4 years. She also has a water fountain. She hasn’t had an UTI in over 4 years. She’s a strange cat, doesn’t eat any people or wet food(maybe a little tuna). She does love the Royal Canin treats Urinary.
Cimbadeo
20 Sep 2021

Mixed results between dry and canned food!

My 4yo cat had a complete urinary blockage and rising kidney levels and was a "true pet emergency." He was admitted to vet ICU and had surgery the next day with final diagnosis of calcium oxalate stone. Vet provided samples of this brand and one other brand in both dry and wet formulas. My guy did fine on this dry formula when mixed with the other brand's wet. But when I mixed this brands' dry and wet formula together, he threw up all his meals one day and the following morning. I switched the wet back to the other brand and he is no longer vomiting. I came to this website to research his dietary options and didn't realize vomiting is a reported issue. My cat has never vomited food or even hairballs. I was especially concerning when he vomited during his recovery when his appetite and weight gain was only slowly returning. My cat is used to a real meat diet and I am also concerned about by-product being the first ingredient in this product.
Real Food
17 Sep 2021

Feed your cats a raw diet. They are meat eaters.

Google the following: Cats raw diet obligate carnivore
28 Aug 2021

Glad I'm not the only one (but for bad reasons!)

I had been scratching my head about my cat's sudden and dramatic VOMITING episodes, when Google led me here. I have also been using the Royal Canin SO for dissolving struvite stones (she won't eat the Hills C/D dry), and she will throw up huge undigested piles of this dry food, a minimum of twice per day. Expensive AND scary! Not to mention that when eating only this dry food (no wet; ran out for a few days), she gets the most heinous diarrhea I have ever seen. Looks like I'll be bucking this food like the other people in these reviews...
Tif75
27 Aug 2021

Vomit

As soon as I purchased the urinary so dry cat food, both of my cats started to throw up.I should have read the 7+ pages of negative reviews regarding the same issue before I made this purchase.
Sam842
25 Aug 2021

Vomiting

My cat has also been vomiting due to this food. Initially we mistook this for scarfing and barfing, but even after reducing the amount per serving, he continued to vomit. Royal Canin really needs to look into this, because as soon as I saw all the reviews, we had him switch to something else and he's since stopped vomiting. It's great for making sure my cat urinates properly, but the fact that he's vomited so frequently is not okay.
HunterGHandyman
25 Aug 2021

Loved it Until Recently

I've had two cats on this food for years & they were fine until recently. Now, both cats are throwing up almost daily.
Tara A
23 Aug 2021

Vomit and lack of interest.

Charlie has been on Urinary SO for almost 12 years. Used to gobble it up. Last few bags he turns his nose up at it. I put water in it or mix it with some wet food, he will eat some. Not even sure if he gets any benefit from it at this point as half the time he throws it up. He has lost 3 pounds in the last year. Blood work all normal so I know it isn’t a health issue. Pretty fed up at this point. This is expensive food.