Provides nutrition that aids in the management of pure struvite uroliths.

Relative Supersaturation (RSS) methodology predicts the crystallization potential of urine. RSS is used to develop diets that lower the concentration of ions contributing to struvite and calcium oxalate urolithiasis.

Increasing the urine volume reduces the saturation of urine with calcium oxalate and struvite crystals.

Reduced level of magnesium, a natural component of struvite stones.

Specially formulated to assist in the management of struvite and calcium oxalate crystals and stones in adult dogs.

Working toward a sustainable future

Our belief that pets make our world better inspires and gives life to our purpose of making a better A BETTER WORLD FOR PETS ™

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Labrador Retriever adult sitting with its owner outdoors

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

Calorie Content

This diet contains 3717 kilocalories of metabolizable energy (ME) per kilogram or 320 kilocalories ME per cup on an as fed basis (calculated).

Crude Protein (min)16.0%, Crude Fat (min)15.0%, Crude Fiber (max)4.2%, Moisture (max)11.5%, Eicosapentaenoic Acid (EPA) (min)0.08%, Docosahexaenoic Acid (DHA) (min)0.05%, Calcium (max)0.63%, Phosphorus (max)0.7%, Magnesium (max)0.08%, Vitamin E (min)427 IU/kg, Lutein* (min)5 mg/kg.

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

Dry Feeding

Dog Weight Normal Overweight
4.4 lb (2 kg) 1/2 cup (48 g) 1/2 cup (41 g)
11 lb (5 kg) 1 1/8 cups (95 g) 1 cup (82 g)
22 lb (10 kg) 1 7/8 cups (159 g) 1 5/8 cups (138 g)
33 lb (15 kg) 2 1/2 cups (216 g) 2 1/8 cups (187 g)
44 lb (20 kg) 3 1/8 cups (268 g) 2 5/8 cups (232 g)

Mixed Feeding

Weight Can + Normal Overweight
4.4 lb (2 kg) 1/4 can + 1/8 cup (14 g) 1/8 cup (8 g)
11 lb (5 kg) 1/4 can + 3/4 cup (61 g) 1/2 cup (48 g)
22 lb (10 kg) 1/2 can + 1 1/8 cups (92 g) 7/8 cups (71 g)
33 lb (15 kg) 1/2 can + 1 3/4 cups (149 g) 1 3/8 cups (120 g)
44 lb (20 kg) 1 can + 1 1/2 cups (134 g) 1 1/8 cups (98 g)
Royal Canin Veterinary Diet Canine Urinary SO Dry Dog Food

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Customer reviews

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!
Texas Rex
26 Nov 2023

Exceptional Results for 15 years

At 3yo our Cairn Terrior/Chi Mix was diagnosed with a rare bladder issue that required surgery to save his little life. Our vet attempted twice and finally a specialist removed/repaired what was needed to save Rex. Royal Canine SO was prescribed and we have never given anything else. REX IS NOW 21 YEARS OLD. No kidney/bladder issues for this chap! We are
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!
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!
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%
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.
03 Jun 2022

Keeps My Schnauzer Crystal Free

My mini schnauzer was having really bad urine crystals and has been on this formula for 6 years and hasn’t had any crystals in her urine since we switched.
31 May 2022

Our pet loves it and is getting healthier too.

Our poodle loves this food. She is happier and healthier on it too.
31 May 2022

My dog loves it!

Lucy has been on Royal Canin Urinary SO Dry Dog Food for about 2 years now, due to bladder stones that had to be surgically removed. She loves the dry food. I also buy her the canned food as a treat here and there.