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

WEIGHT MANAGEMENT: Low calorie dog food (11% less than Royal Canin Urinary SO Dry Dog Food) for ideal weight maintenance

BLADDER HEALTH: RSS methodology for dog 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 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. Moderate calorie content (11% less than Royal Canin Urinary SO dry dog 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 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.

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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.


Corn, brewers rice, brown rice, chicken by-product meal, corn gluten meal, powdered cellulose, chicken fat, dried chicory root, natural flavors, salt, wheat gluten, vegetable oil, potassium chloride, 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 oxide, ferrous sulfate, manganous oxide, copper sulfate, sodium selenite, calcium iodate], marigold extract (Tagetes erecta L.), L-carnitine, rosemary extract, preserved with mixed tocopherols and citric acid.

Calorie Content

This diet contains 3312 kilocalories of metabolizable energy (ME) per kilogram or 272 kilocalories ME per cup on an as fed basis (calculated).

Nutrient Amount
Crude Protein (min)18.0%
Crude Fat (min)9.0%
Crude Fat (max)13.0%
Crude Fiber (max)7.2%
Moisture (max)10.0%
Calcium (max)0.81%
Phosphorus (max)0.7%
Magnesium (max)0.1%.

Dry Feeding

Dog Weight Low Activity Medium Activity
4.4 lb (2 kg) 1/2 cup (39 g) 5/8 cup (47 g)
11 lb (5 kg) 1 cup (79 g) 1 1/8 cups (93 g)
22 lb (10 kg) 1 5/8 cups (132 g) 1 7/8 cups (157 g)
33.1 lb (15 kg) 2 1/4 cups (179 g) 2 5/8 cups (213 g)
44.1 lb (20 kg) 2 3/4 cups (222 g) 3 1/4 cups (264 g)

Dry Feeding

Dog Weight Can / Day Low Activity Medium Activity
4.4 lb (2 kg) 1/4 1/4 cup (24 g) 3/8 cup (31 g)
11 lb (5 kg) 1/2 5/8 cup (47 g) 3/4 cup (62 g)
22 lb (10 kg) 1 3/4 cup (65 g) 1 1/8 cup (89 g)
33.1 lb (15 kg) 1 1 1/2 cup (120 g) 1 7/8 cup (154 g)
44.1 lb (20 kg) 1 2 1/8 cup (171 g) 2 5/8 cup (213 g)
Urinary SO Moderate Calorie Dry Dog Food

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Customer reviews

Frenchy Lola
02 Jun 2022

Frenchy Favorite

Lola the frenchy has issues with calcium oxalate stones and this food has proven to be extremely beneficial to her well being. She has had 2 surgeries for stone removal and since being on this food we have been able to manage her condition. She also loves the Urinary SO treats and loaf. Keep up the good work Royal Canin. We would be lost without this product.
04 Jun 2021

This product does exactly what it says for my pet!

I have been using this for several years now. Molly loved it the first time I gave it to her and still does.
12 Feb 2021


After my small dog had stones my vet put him on this food. Two years later he's doing great
25 May 2020

Formula Change

After only being on the new formula for 1.5 months by Bichon Frise (9yrs) now has tear staining (never been an issue), a yellow muzzle (typically only an issue with food with dye in it), skin allergy issues and intermittent diarrhea. Giving it another week but probably going to start looking for a new food. The old formula never gave her these issues.
Tilleys momma
17 Apr 2020

Formula change. Holy stink!!

Most recent bag, with new image appears to have a formula change. Springer has been on this food for 2 years. Really helped with preventing crystals, but new formula is producing excessive gas that was not a problem with the old formula. PLEASE SWITCH BACK!!! Tilley can clear a room!
14 Apr 2020

Formula Changed

Like others who commented, my small breed dog was on the green label for 6 years with no issues. I purchased two bags of the brown label and ever since she has gas, loose stools, and gland issues.
23 Mar 2020

She's better!

Our dog, Roxy, was leaving very concentrated urine spots all over the house. I thought she may have a bladder infection but our vet found her urine was loaded with crystals. I can just imagine how painful it was for her to void with the sharp crystals hitting her bladder and urethral walls. He said we caught it before the crystals had time to form into a stone. He had us change her food to Royal Canin Urinary SO dry dog food.and add some water to it. She was better in days, without side effects, and has not had anymore crystals for 2 years. It is expensive but worth it. I save some money by using the Royal Canin autoship program.
23 Mar 2020

Product change

My miniature schnauzer had eaten the green label kibble for years with no problem. Change the formula and he has thrown up more than he’s digested. Schnauzers can’t tolerate the additional fat you’ve added per the response I received from your customer service.
10 Mar 2020

Bloated, constipated and wind

Our female Shichon (6 years old) was diagnosed with bladder crystals. Since going on to this food she is constipated, bloated, having very bad wind and is clearly in discomfort. Back to the vets for their next suggestion.... We have used Satiety and Weight Loss to keep her at a healthy weight and these have been ok but this Urinary SO dry food is making her really not herself at all. We tried the wet version - made her violently sick!
10 Feb 2020

New Formula - sick dog

My dog has been on the new formula for about 7 days and it has made her sick. Up all night with stomach pains and excessive gas. Previously used the green label can for 4 years without issue. I am so disappointed.