Relative Supersaturation (RSS) methodology predicts the crystallization potential of urine. RSS is used to develop diets for dogs prone to both struvite and oxalate urolithiasis.

Formulated with a special blend of fibers to promote satiety and reduce the spontaneous consumption of food.

Specially formulated to assist in the management of struvite and calcium oxalate crystals and stones and to assist in healthy weight loss while reducing hunger between meals in the canine patient.

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Labrador Retriever adult sitting with its owner outdoors

Chicken by-product meal, pea fiber, corn gluten meal, powdered cellulose, tapioca, corn, wheat gluten, natural flavors, wheat, chicory, chicken fat, salt, fish oil, psyllium seed husk, monocalcium phosphate, DL-methionine, potassium chloride, vegetable oil, fructooligosaccharides, calcium sulfate, vitamins [DL-alpha tocopherol acetate (source of vitamin E), niacin supplement, biotin, riboflavin supplement, D-calcium pantothenate, thiamine mononitrate (vitamin B1), pyridoxine hydrochloride (vitamin B6), vitamin A acetate, vitamin B12 supplement, folic acid, vitamin D3 supplement], calcium carbonate, choline chloride, N-butyric acid, L-lysine, glucosamine hydrochloride, trace minerals [zinc proteinate, zinc oxide, ferrous sulfate, manganese proteinate, manganous oxide, copper sulfate, calcium iodate, copper proteinate, sodium selenite], L-carnitine, chondroitin sulfate, rosemary extract, preserved with mixed tocopherols and citric acid.

Calorie Content

This diet contains 2897 kilocalories of metabolizable energy (ME) per kilogram or 243 kilocalories ME per cup on an as fed basis (calculated).

Crude Protein (min)28.0%
Crude Fat (min)7.5%
Crude Fiber (max)16.1%
Moisture (max)10.0%
Glucosamine* (min)750 mg/kg
Chondroitin Sulfate* (min)8 mg/kg

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

Dry Feeding

Target Adult Weight Starting Weight Loss After 4 Weeks Maintenance After Weight Loss
4.4 lb (2 kg) 1/2 cup (44 g) 1/2 cup (38 g) 1/2 cup (41 g)
11 lb (5 kg) 1 cup (87 g) 7/8 cup (75 g) 1 cup (82 g)
22 lb (10 kg) 1 3/4 cups (146 g) 1 1/2 cups (125 g) 1 5/8 cups (138 g)
33.1 lb (15 kg) 2 3/8 cups (198 g) 2 cups (170 g) 2 1/4 cups (187 g)
44.1 lb (20 kg) 2 7/8 cups (246 g) 2 1/2 cups (211 g) 2 3/4 cups (232 g)
66.1 lb (30 kg) 4 cups (334 g) 3 3/8 cups (286 g) 3 3/4 cups (315 g)
77.2 lb (35 kg) 4 1/2 cups (375 g) 3 7/8 cups (321 g) 4 1/4 cups (353 g)
88.2 lb (40 kg) 4 7/8 cups (414 g) 4 1/4 cups (355 g) 4 5/8 cups (390 g)
99.2 lb (45 kg) 5 3/8 cups (452 g) 4 5/8 cups (388 g) 5 1/8 cups (426 g)
110.2 lb (50 kg) 5 7/8 cups (489 g) 5 cups (420 g) 5 1/2 cups (462 g)
132.3 lb (60 kg) 6 5/8 cups (561 g) 5 3/4 cups (481 g) 6 1/4 cups (529 g)

Mixed Feeding

Weight Can + Starting Weight Loss After 4 Weeks Maintenance After Weight Loss
4.4 lb (2 kg) 1/4 can + 1/4 cup (22 g) 1/4 cup (16 g) 1/4 cup (20 g)
6.6 lb (3 kg) 1/4 can + 1/2 cup (38 g) 3/8 cup (29 g) 3/8 cup (34 g)
8.8 lb (4 kg) 1/2 can + 3/8 cup (30 g) 1/4 cup (20 g) 1/4 cup (26 g)
11 lb (5 kg) 1/2 can + 1/2 cup (44 g) 3/8 cup (31 g) 1/2 cup (39 g)
13 lb (6 kg) 1/2 can + 5/8 cup (56 g) 1/2 cup (42 g) 5/8 cup (51 g)
22 lb (10 kg) 1 can + 3/4 cup (60 g) 1/2 cup (39 g) 5/8 cup (51 g)
27 lb (12 kg) 1 can + 1 cup (81 g) 5/8 cup (57 g) 7/8 cup (72 g)
35 lb (16 kg) 1 can + 1 1/2 cup (122 g) 1 1/8 cup (92 g) 1 1/4 cup (110 g)
44 lb (20 kg) 1 can + 1 7/8 cup (160 g) 1 1/2 cup (124 g) 1 3/4 cup (146 g)
55 lb (25 kg) 1 can + 2 3/8 cup (204 g) 2 cup (163 g) 2 1/4 cup (188 g)
66 lb (30 kg) 1 can + 3 cup (247 g) 2 3/8 cup (199 g) 2 3/4 cup (228 g)
77 lb (35 kg) 1 can + 3 3/8 cup (288 g) 2 3/4 cup (234 g) 3 1/8 cup (267 g)
88 lb (40 kg) 1 can + 3 7/8 cup (327 g) 3 1/4 cup (268 g) 3 5/8 cup (304 g)
110 lb (50 kg) 1 can + 4 3/4 cup (403 g) 4 cup (333 g) 4 1/2 cup (375 g)
132 lb (60 kg) 1 can + 5 5/8 cup (475 g) 4 3/4 cup (394 g) 5 1/4 cup (443 g)
Royal Canin Veterinary Diet Canine Urinary SO + Satiety Dry Dog Food

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Customer reviews

Cher 268
30 Oct 2019

Cheryl Schommer

[This review was collected as part of a promotion.] We have had Gabby on this diet most of her life. It works great, keeping her healthy and she has a beautiful coat as well.
Ruby dog
30 Oct 2019

Great dog food

[This review was collected as part of a promotion.] Use this everyday since Vet recommendation. Had help my dog tremendously!
DaMoon
29 Oct 2019

I get confused when the names are so similar

[This review was collected as part of a promotion.] This food is keeping stone surgery at bay, and I am grateful.
DKLR
23 Oct 2019

Keeps my dog healthy

[This review was collected as part of a promotion.] I've been feeding this to my border collie for several years after a serious UTI with crystals in her urine. She has has been crystal free with no UTI's since. I highly recommend this dog food for any dog that has frequent UTI's.
Chrissyb
22 Oct 2019

SO canned food

[This review was collected as part of a promotion.] This has been wonderful for my dog! No Issues in years since he started on it!! Also I’ve been making my own treats with this and freeze them. He loves them!!
Piper2Lacie
22 Oct 2019

My fur baby loves it

[This review was collected as part of a promotion.] My vet put my baby on this food 2 years ago and it has performed perfectly. She has never felt better.
cf39
19 Aug 2019

A few years ago, my 7 year old Shiba decided that Thanksgiving day would be a great day for a UTI. The emergency vet (pronounced 'really really expensive vet') fixed her up for the day, but recommended that I go for additional testing at her regular vet. Lo and behold, little Roxy was predisposed to crystals in her bladder. No good. Our vet prescribed the regular old Urinary SO food, which completely and absolutely cut out the UTIs and crystals. However, after Roxy got to be a bit chubby later on, we learned that part of its effectiveness at reducing crystals was due to its high fat content. Enter: this food. I will stick to the short version here. 0 UTIs, and a leaner, meaner shibe. My only complaint is that this food is veryyyyy expensive.
Hoot
03 Nov 2018

This food keeps my dogs ph level safe so his bladder doesn’t get irritated.
mum970
31 Oct 2018

Great features

[This review was collected as part of a promotion.] Been buying for over a year and my dog loves the food and I love the fact that I am reassured that should not have any more crystals..
Scotty67
31 Oct 2018

Recommended by vet

[This review was collected as part of a promotion.] Crystals were found in urinalysis. Last visit to vet showed no crystals. I have not one but two shelties and thanks to this diet neither have crystals anymore THANK YOU!!