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.

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 lower urinary tract disease and to assist in healthy weight loss while reducing hunger between meals in the feline patient.

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Labrador Retriever adult sitting with its owner outdoors

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

Calorie Content

This diet contains 2911 kilocalories of metabolizable energy (ME) per kilogram or 239 kilocalories ME per cup on an as fed basis (calculated).

Crude Protein (min)32.0%
Crude Fat (min)8.6%
Crude Fat (max)10.0%
Crude Fiber (max)15.0%
Moisture (max)8.0%
Calcium (max)1.65%
Phosphorus (max)1.4%
Magnesium (max)0.15%
Glucosamine* (min)370 mg/kg
Chondroitin sulfate* (min)4 mg/kg.

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

Dry Feeding

Body Weight Weight Loss* Post Weight-loss Maintenance
4.4 lb (2 kg) 1/4 - 3/8 cup (23 - 29 g) 3/8 cup (31 g)
6.6 lb (3 kg) 3/8 - 1/2 cup (31 - 39 g) 1/2 cup (41 g)
8.8 lb (4 kg) 1/2 - 5/8 cup (38 - 47 g) 5/8 cup (50 g)
11.0 lb (5 kg) 1/2 - 5/8 cup (44 - 56 g) 3/4 cup (59 g)
13.2 lb (6 kg) 5/8 - 3/4 cup (50 - 63 g) 7/8 cup (67 g)
15.4 lb (7 kg) 5/8 - 7/8 cup (56 - 71 g) 7/8 cup (75 g)
17.6 lb (8 kg) 3/4 - 1 cup (62 - 78 g) 1 cup (82 g)
19.8 lb (9 kg) 7/8 - 1 cup (67 - 84 g) 1 1/8 cups (89 g)
22.0 lb (10 kg) 7/8 - 1 1/8 cups (72 - 91 g) 1 1/8 cups (96 g)

Mixed Feeding

Weight Can + Starting Weight Losss After 4 Weeks Maintenance After Weight Loss
4.4 lb (2 kg) 1/2 can + 1/8 cup (13 g) 1/8 cup (7 g) 1/8 cup (15 g)
5.5 lb (2.5 kg) 1/2 can + 1/4 cup (18 g) 1/8 cup (11 g) 1/4 cup (20 g)
6.6 lb (3 kg) 1/2 can + 1/4 cup (22 g) 1/8 cup (15 g) 1/4 cup (25 g)
7.7 lb (3.5 kg) 1/2 can + 3/8 cup (27 g) 1/4 cup (18 g) 3/8 cup (29 g)
8.8 lb (4 kg) 1 can + 1/4 cup (16 g) 1/8 cup (6 g) 1/4 cup (18 g)
9.9 lb (4.5 kg) 1 can + 1/4 cup (20 g) 1/8 cup (9 g) 1/4 cup (23 g)
11 lb (5 kg) 1 can + 1/4 cup (24 g) 1/8 cup (12 g) 3/8 cup (27 g)
12 lb (5.5 kg) 1 can + 3/8 cup (27 g) 1/4 cup (15 g) 3/8 cup (31 g)
13 lb (6 kg) 1 can + 3/8 cup (31 g) 1/4 cup (18 g) 1/2 cup (35 g)
14 lb (6.5 kg) 1 can + 1/2 cup (35 g) 1/4 cup (21 g) 1/2 cup (38 g)
15 lb (7 kg) 1 can + 1/2 cup (38 g) 1/4 cup (24 g) 1/2 cup (42 g)
17 lb (7.5 kg) 1 can + 1/2 cup (42 g) 3/8 cup (27 g) 5/8 cup (46 g)
18 lb (8 kg) 1 can + 5/8 cup (45 g) 3/8 cup (29 g) 5/8 cup (49 g)
19 lb (8.5 kg) 1 can + 5/8 cup (49 g) 3/8 cup (32 g) 5/8 cup (53 g)
20 lb (9 kg) 1 can + 5/8 cup (52 g) 1/2 cup (35 g) 3/4 cup (56 g)
21 lb (9.5 kg) 1 can + 3/4 cup (55 g) 1/2 cup (37 g) 3/4 cup (60 g)
22 lb (10 kg) 1 can + 3/4 cup (58 g) 1/2 cup (40 g) 3/4 cup (63 g)
Royal Canin Veterinary Diet Feline Urinary SO + Satiety Dry Cat Food

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Customer reviews

Jennifer and Jeremy
15 May 2023

So far so good!

Feeding both cats. One cat overweight and crystal problems. Expensive but so far it’s been working. Will follow up with review in a years time or sooner if it does not working. But so far after 3 months very happy with eliminating crystals and curving begging for more food.
Plombardi85
22 Dec 2021

Resealable bags are cheaply made!

The last 3 bags I have purchased have had a broken seal for the resealable part of it. Very disappointed considering the food spoils if not sealed and then my cat wont eat it. I have purchased both the SO bag and the Satiety/SO bag and both were defective.
Dee64
28 Oct 2021

My cats love it....

Although I only gave 4 stars this brand works well. Since the new ingredients have been introduced into the food, my cats were getting sick frequently. I then reduced the servings and now there is like no vomiting. I still give them the recommended amount but feedings are a little more frequent throughout the day.
Katlan55
04 Nov 2019

[This review was collected as part of a promotion.] I bought this to help my cat as she pees all over the floor and having this makes her not so it
Tima
03 Nov 2019

[This review was collected as part of a promotion.] Our cat has been on this food for about 5-6 years and is thriving on it!
Willie SD
01 Nov 2019

Good features

[This review was collected as part of a promotion.] I have had my cat (Adult Male named Willie) is on this special diet prescription cat food for the last two years. It is expensive but has helped him lose weight from 18LB to 9.5LB. It has helped him with his urinary track issues. High Ash and he is not quite satiated. He will cry for more after eating his portions.
Chaz411
31 Oct 2019

No more crystals

[This review was collected as part of a promotion.] We have been this food exclsivley to our kitties for the last 6 years. Thankfully, no more bladder obstructions or crystals
Jenn0427
31 Oct 2019

Great quality food

[This review was collected as part of a promotion.] I feed this food to my cats after my vet recommended this product! My cats love the taste and have no additional health problems since.... my cats are picky and they love this food.
toddybear
30 Oct 2019

Eats It Every Day!

[This review was collected as part of a promotion.] My kitty cat can hardly wait until it's in the bowl!
Orcagirl
30 Oct 2019

Very effective

[This review was collected as part of a promotion.] My cat has had urinary crystals and weight problems for a long time now, after switching him to the RC urinary and satiety all those problems are gone! It's amazing how RC can combine foods for animals with multiple health issues!