Helps dissolve pure struvite stones and helps prevent calcium oxalate stones

Lowers the risk of crystal formation using RSS methodology for bladder health

Supports urinary health with an exclusive S/O Index, and creates an environment unfavorable to crystal formation in the bladder

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.)

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

20 Nov 2020

Looking for Guidance

My 8 year old cocker, neutered male, has been on the prescription version of Urinary SO and he enjoys it heartily! The vet, whom I trust, prescribed this because of heart problems. But his poo has become quite smelly and wet. And his skin is quite dry despite taking fish oil daily. Any thoughts?
10 Apr 2020

Works well and my dog loves it!

My 12 year old female Cardigan Welsh Corgi had a bladder full of struvite stones and in just a few weeks, xrays show almost none. She loves the food and we wouldn’t be happier!
08 Apr 2020

He won't touch it until.......

Zephyr just sniffs and walk way until I give him some of the canned SO on top of the dry food. He is spoiled by the canned SO.
Dino 14
18 Feb 2020

Kidney stone free for 7 years.

We have been giving our Lhasa Apso this dog food for 7 years and he only had kidney stones once this year in January. Without the food he never would have gone this length of time kidney stone free. Very happy that the food is available.
15 Nov 2019

Urinary SO after Bladder Stone

Our dog had to have a bladder stone removed and she was placed on this dog food afterwards to prevent recurrent stones. It has been 2 years now and no signs of recurrent stones! She loves this food, along with our other dogs! It's higher in calories, so be careful on portion size to prevent weight gain! It is on the expensive side, so be on the look out for coupons. FYI, it is sold by prescription.
09 Nov 2019

My small dog loves the flavor!

My veterinarian recommended this for my shih tzu several years ago after an instance of bladder stones. Since on this food, she's had no re-occurences.
09 Nov 2019

Thank you.

My fur baby has been on this food for several years now. It is amazing how healthy she is now. We haven’t had any problems (infections) since she has been on the product routinely. Thanks for making a stable product!
Rusty S
04 Nov 2019

it has kept my doxie from forming kidney stones wh

Ginger my doxie has been eating So dry kibble and wet food for 3 yrs now with no formation of kidney stones...enough said..
03 Nov 2019

Tailored to my dog's needs

I had no idea that dog food could be so tailored to your individual dog's needs. This helped her get better.
01 Nov 2019

My dogs love Royal Canin

My dogs love the food. Its healthy and needed for one of my dogs and she loves it. I am very happy with the food. It has kept my dog from getting crystals and or stones.