HELPS PREVENT STONES: Specialized adult cat food helps dissolve pure struvite stones and helps prevent calcium oxalate stones

WEIGHT MANAGEMENT: Low calorie cat food (10% less calories than Royal Canin Urinary SO Dry Cat Food) for ideal weight maintenance

BLADDER HEALTH: RSS methodology for cat bladder health helps lower the risk of crystal formation

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

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. Moderate calorie content (10% less than Royal Canin Urinary SO dry cat food) helps them maintain a healthy weight. 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. 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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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.


Chicken by-product meal, brewers rice, corn, corn gluten meal, powdered cellulose, wheat gluten, natural flavors, chicken fat, salt, fish oil, potassium chloride, calcium sulfate, egg product, sodium bisulfate, vegetable oil, sodium pyrophosphate, DL-methionine, fructooligosaccharides, monocalcium phosphate, 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], taurine, 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.), L-carnitine, rosemary extract, preserved with mixed tocopherols and citric acid.

Calorie Content

This diet contains 3277 kilocalories of metabolizable energy (ME) per kilogram or 275 kilocalories ME per cup on an as fed basis (calculated).

Nutrient Amount
Crude Protein (min)32.0%
Crude Fat (min)9.0%
Crude Fat (max)13.0%
Crude Fiber (max)9.3%
Moisture (max)8.0%
Calcium (max)1.4%
Phosphorus (max)1.3%
Magnesium (max)0.08%.

Dry Feeding

Cat Weight Low Activity Medium Activity
4.4 lb (2 kg) 3/8 cup (29 g) 3/8 cup (36 g)
6.6 lb (3 kg) 1/2 cup (39 g) 5/8 cup (49 g)
8.8 lb (4 kg) 5/8 cup (48 g) 3/4 cup (60 g)
11 lb (5 kg) 5/8 cup (56 g) 7/8 cup (70 g)
13.2 lb (6 kg) 3/4 cup (64 g) 1 cup (80 g)
15.4 lb (7 kg) 7/8 cup (71 g) 1 cup (89 g)
17.6 lb (8 kg) 7/8 cup (78 g) 1 1/8 cups (98 g)

Mixed Feeding

Cat Weight Cans / Day Low Activity Medium Activity
4.4 lb (2 kg) 1 1/8 cup (10 g) 1/4 cup (19 g)
6.6 lb (3 kg) 1 1/4 cup (20 g) 3/8 cup (32 g)
8.8 lb (4 kg) 1 3/8 cup (29 g) 1/2 cup (44 g)
11 lb (5 kg) 1 1/2 cup (37 g) 5/8 cup (56 g)
13.2 lb (6 kg) 1 1/2 cup (45 g) 3/4 cup (67 g)
15.4 lb (7 kg) 1 5/8 cup (52 g) 7/8 cup (77 g)
17.6 lb (8 kg) 1 3/4 cup (59 g) 1 cup (87 g)
Urinary SO Moderate Calorie Dry Cat Food

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Customer reviews

Unsatisfied customer
14 Jan 2023

INSANE Price hikes!

This food was $70/bag less than two years ago which was already crazy… it is now $105 for a 17lb bag!!! RIDICULOUS! My cat needs this or it will die and this company is taking advantage of the current economic climate and drastically hiking their prices because they know we have no other choice if we care about the health of our animals. So infuriating when a company claiming to care about my animal is only worried about digging deeper in my pockets for profit. Shame on you. Plus your food makes my cat vomit multiple times a week after eating- especially when it’s a fresh bag or at the end of the bag of food. Sad I don’t have another option or I’d RUN in that direction.
Cats Rock
05 Jun 2022

No more worries

After my boy plugged, I put him on the S/O. All 3 of my cats eat it and love it.
31 May 2022

Good Health Diet

He has been on it for 3 years and is alt mor frisky and very healthy.
31 May 2022


My cats love it. Their weight is getting better each time
31 May 2022

My cat loves it!

My vet recommended I start my 10 year old cat on this product. Although she hasn’t developed crystals, she has shown the beginning signs of it. She has only been on this food for about one month, but she really loves the taste and so far has been doing well on it.
31 May 2022

18 Sep 2021

One of my cats had urinary issues and the vet recommended RC Urinary SO. She said I could feed it to all my cats...(of course she did because I had to buy it at her clinic and it costs a small fortune when you're feeding it to 3 cats). Shortly thereafter all my cats began puking up the food. Between the three cats there was at least one puke to clean up daily. Horrible. I switched to Hills Urinary dry and wet food and the puking has greatly reduced to once a week. And I can get it at all pet supply stores. Amazing
27 Jun 2021

Cats vomiting

I have three cats, and they’ve all eaten RC urinary SO mod calorie for quite a few years. We’ve noticed vomiting of full kibble and thought maybe they're just gorging, but we have an automatic feeder. I’ve noticed my one guy has lost some weight over the last few months, but I thought it was due to increased activity. But the vomiting has gotten worse and I frantically left a message for my vet this weekend since one cat puked 5 times in one day and has avoided the dry food like the plague. I’ve been giving can food and he has not puked since, and neither have the other two. I decided to investigate reviews on this food and found many cat parents having the same issue!!!! Turns out royal canin has changed the product! My poor babies!!! I feel like such a terrible cat mom for letting this happen to them! I’m expecting a call from my vet as soon as they open, and of course to be safe I’m taking him in, but what a shame to spend $77 on a bag of food that all three eat and then have to pay for vet bills because said food has been making them sick!
10 May 2021

Great Product

I put my cat on this after a urinary blockage. He loves it and is doing great. He has slimmed down a lot from his previous weight of 21 pounds (he's part Maine Coon) and his fur doesn't get matted like it did before. The calming effects of it are very noticeable as well. He used to be scared of everyone and everything. He is much more calm and has really come out of his shell. He is almost 7 and it has been a great change of diet for him. My other 3 cats love it as well and will eat from his bowl whenever they can.
Royal Canin response
Great to hear he is doing so well!
01 Apr 2021

New for ula is awful

My cat shave both gained weight after the formula change. No happy with wheat being added. Switching to another brand