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

BLADDER HEALTH: Lowers the risk of crystal formation using RSS methodology for dog 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 dog 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 dog food was developed to nutritionally support your adult dog’s urinary tract and bladder health. It increases the amount of urine your dog 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 dogs. Talk to your veterinarian about keeping your dog on this urinary dog food for long-term urinary support. And ask them about the right Royal Canin wet dog food and treats to complement your dog’s diet.

With nearly 50 years of scientific research and observation, Royal Canin continues to deliver targeted nutrition to feed every pet’s magnificence. Not satisfied? Then neither are we. Our veterinary exclusive formulas are 100% satisfaction guaranteed. (Just contact us for more details.)

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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.

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

Calorie Content

This diet contains 3741 kilocalories of metabolizable energy (ME) per kilogram or 333 kilocalories ME per cup on an as fed basis (calculated).

Nutrient Amount
Crude Protein (min)17.0%
Crude Fat (min)15.0%
Crude Fiber (max)3.7%
Moisture (max)10.0%
Eicosapentaenoic Acid (EPA) (min)0.08%
Docosahexaenoic Acid (DHA) (min)0.05%
Calcium (max)0.75%
Phosphorus (max)0.7%
Magnesium (max)0.08%
Vitamin E (min)350 IU/kg
Lutein* (min)5 mg/kg.

*Not recognized as an essential nutrient by the AAFCO Dog Food Nutrient Profiles.

Dry Feeding

Dog Weight Low Activity Medium Activity High Activity
4.4 lb (2 kg) 1/2 cup (41 g) 1/2 cup (47 g) 5/8 cup (54 g)
8.8 lb (4 kg) 3/4 cup (68 g) 7/8 cup (79 g) 1 cup (90 g)
13 lb (6 kg) 1 cup (93 g) 1 1/4 cups (107 g) 1 3/8 cups (122 g)
18 lb (8 kg) 1 1/4 cups (115 g) 1 1/2 cups (133 g) 1 3/4 cups (151 g)
22 lb (10 kg) 1 1/2 cups (136 g) 1 3/4 cups (158 g) 2 cups (179 g)
33 lb (15 kg) 2 1/8 cups (184 g) 2 3/8 cups (214 g) 2 3/4 cups (243 g)
44 lb (20 kg) 2 5/8 cups (229 g) 3 cups (265 g) 3 3/8 cups (301 g)
55 lb (25 kg) 3 cups (271 g) 3 1/2 cups (313 g) 4 cups (356 g)
66 lb (30 kg) 3 1/2 cups (310 g) 4 cups (359 g) 4 5/8 cups (408 g)
77 lb (35 kg) 3 7/8 cups (348 g) 4 1/2 cups (403 g) 5 1/8 cups (458 g)
88 lb (40 kg) 4 3/8 cups (385 g) 5 cups (446 g) 5 3/4 cups (506 g)
99 lb (45 kg) 4 3/4 cups (420 g) 5 1/2 cups (487 g) 6 1/4 cups (553 g)

Mixed Feeding

Dog Weight Cans / Day Low Activity Medium Activity High Activity
4.4 lb (2 kg) 1/4 1/4 cup (18 g) 1/4 cup (25 g) 3/8 cup (31 g)
8.8 lb (4 kg) 1/2 1/4 cup (24 g) 3/8 cup (35 g) 1/2 cup (45 g)
13 lb (6 kg) 1/2 1/2 cup (48 g) 3/4 cup (63 g) 7/8 cup (77 g)
18 lb (8 kg) 1/2 3/4 cup (70 g) 1 cup (89 g) 1 1/4 cups (107 g)
22 lb (10 kg) 1 1/2 cup (47 g) 3/4 cup (68 g) 1 cup (90 g)
33 lb (15 kg) 1 1 1/8 cups (95 g) 1 3/8 cups (124 g) 1 3/4 cups (153 g)
44 lb (20 kg) 1 1 5/8 cups (139 g) 2 cups (176 g) 2 3/8 cups (212 g)
55 lb (25 kg) 1 2 cups (181 g) 2 1/2 cups (224 g) 3 cups (267 g)
66 lb (30 kg) 1 2 1/2 cups (221 g) 3 cups (270 g) 3 5/8 cups (319 g)
77 lb (35 kg) 1 2 7/8 cups (259 g) 3 1/2 cups (314 g) 4 1/8 cups (369 g)
88 lb (40 kg) 1 3 3/8 cups (295 g) 4 cups (356 g) 4 3/4 cups (417 g)
99 lb (45 kg) 1 3 3/4 cups (331 g) 4 1/2 cups (397 g) 5 1/4 cups (464 g)
Urinary SO Dry Dog Food

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Customer reviews

Qkurk
13 Dec 2024

It worked, but smells awful!

This food worked to reduce the cystals. Even though my dog ate it, it smelled awful and her poops were orange and mushy. Wondering what the PH level is for this food?
Royal Canin response
We are sorry for any inconvenience caused. Please reach us out at [email protected] for best assistance.
K from Ontario
20 Nov 2024

It worked, however, the dog hates it.

Bought for a Skye Terrier. She normally eats Acana. She had a bladder infection and some struvite stones. After a month, the stones are dissolved, infection cleared up. However, she hates this food. Beyond hates this food. There were days she would starve herself and vomit Bile because she did not want to eat it. Now the vet wants her to stay on this food. I can’t sonit. She needs 2 cups a day and barely eats one cup a day. I’ve tried the sauce, the loaf, it worked for two feedings then she stopped eating it. I cannot feed her this forever. We are starting to mix with the Acana, but I believe it’s only a waste because mixing it defeats the purpose. Not sure if it was the food that dissolved the stones, or her starving herself and drinking a lot of water that dissolved the stones.
Royal Canin response
We are very sorry to know that your dog does not like the formula.
Duckys Grandma
14 Jul 2024

Great for kidneys, but won't eat it

Ducky (-haired chihuahua) is not a big eater... he thinks eating is an inconvenience. He has always eaten (or ignored) Royal Canin. As long as I can lock him in the kitchen till he eats, he has done great. When he went on Royal Canin SO, no more kidney issues. However, he has now decided not to eat it at all. After 3 days, I have caved, gone to the pet store and bought the most nutritionally lacking food I could find. He ate 2 T morning and night. For him, that is a LOT. I am at my wit's end. I have to do something better for him. It can't help him if he does not eat it. Sigh.
Lacigirl
24 May 2024

Must be delicious…

My dog was prescribed this food because of bladder stones. My vet recommended she stay on this food even after her surgery. We’ve had Laci for 14 years and I’ve never seen her so excited to eat. She actually cries in the morning till I get up and feed her. She demolishes it. She has so much energy.
Royal Canin response
We are delighted to hear how much Laci is enjoying it and that she's thriving!
capsully
26 Dec 2023

He’s eating

My vet put my dog on this food due to crystals in his urine. He has been a picky eater and I have thrown out and wasted so much food. He started eating Urinary SO about 2 weeks ago and he has eaten every meal. I can’t believe he actually looks forward to his meals. He loves the food.
Royal Canin response
That is so great to hear! Thank you!
Giarose
05 Sep 2023

I really can’t properly rate this food because my dog hates it. I give it 5 stars for eliminating the Struvite Crystals. It’s a struggle every day. When she get really hungry she will eat a small portion but nothing near what the directions call for. I’m so worried. Broths don’t help at all
Animal nutritionist 584
16 Mar 2023

Awful diet no prescription in it

There’s is no prescription in this diet, there is nothing here to actually help with a problem. If youre looking for help with urinary issues, lower magnesium and phos levels. Simple research!
Zenlife
24 Feb 2023

It worked like magic!

My toy poodle is almost 16 years old and in good health. I work at a veterinary pet hospital. Although my dog had no symptoms requiring X-rays , our vet did them during a routine health exam. We were all shocked to see approximately 18 bladder stones or crystals in my dog’s X-ray. He was exhibiting no signs of symptoms at all. What made this even scarier was that, at 16 years old, would surgery even be an option , if the stones began to cause pain, blood in urine, trouble urinating etc. this was 7 months ago. My veterinarian prescribed Royal Canine SO for urinary tract health. I immediately changed my pet’s diet to a combination of the dry and the wet versions. After 7 months, at my dog’s next complete physical exam, including X-rays , blood work and urine analysis…. Blew us all away…. My beloved friend of 16 years was completely free of bladder stones and crystals. Totally desolved about 18 of them in 6 months ! My very senior dog would not be in pain , facing a possible emergency health situation and a surgery which would most likely, not be an option for him at his age. Royal Canine is a miracle supastah far as I am concerned. Far surpassed what we thought possible!
Belle2020
27 Nov 2022

Very Satisfied

I adopted a Pomeranian from the shelter and she seemed to be having painful episodes and it was found incidentally on xray that she had kidney stones in her bladder. She also had swelling around both her kidneys. We started her on the RC S/O dry food and she loves it. The swelling went down within 6 months and she has not had any painful passing of stones in over 1 year since putting her on this. I trust this brand 100%
Thomas2022
04 Nov 2022

Useless For Dissolving Struvite Stones

Our Maltipoo was diagnosed with a urinary infection and through ultrasound we found she also had bladder stones. There were 3 prescription urinary dog foods that were recommended. I had good luck with my cat and Royal Canin's limited ingredient cat food so I chose to purchase the SO. After two months of feeding there was NO reduction in the stones and expensive surgery followed. Minnesota lab results showed 100% struvite. This food is expensive and useless.