Hydrolyzed soy protein, composed of low molecular weight peptides, is highly digestible and supports gastrointestinal and dermatological health.

Formulated to increase the urine volume and help in the management of both struvite and calcium oxalate crystals through the use of Relative Supersaturation (RSS) methodology.

Specially formulated to assist in the management of struvite and calcium oxalate crystals and stones and adverse food reactions in the feline patient.

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Labrador Retriever adult sitting with its owner outdoors

Brewers rice, hydrolyzed soy protein, chicken fat, powdered cellulose, natural flavors, vegetable oil, dried chicory root, salt, fish oil, calcium sulfate, potassium chloride, sodium pyrophosphate, monocalcium phosphate, sodium silico aluminate, sodium bisulfate, calcium carbonate, DL-methionine, fructooligosaccharides, choline chloride, taurine, vitamins [DL-alpha tocopherol acetate (source of vitamin E), niacin supplement, D-calcium pantothenate, biotin, pyridoxine hydrochloride (vitamin B6), riboflavin supplement, thiamine mononitrate (vitamin B1), vitamin A acetate, vitamin B12 supplement, folic acid], trace minerals [zinc proteinate, zinc oxide, manganese proteinate, manganous oxide, copper sulfate, ferrous sulfate, sodium selenite, copper proteinate, calciumiodate], marigold extract (Tagetes erecta L.), rosemary extract, preserved with mixed tocopherols and citric acid.

Calorie Content

This diet contains 3628 kilocalories of metabolizable energy (ME) per kilogram or 334 kilocalories ME per cup on an as fed basis (calculated).

Crude Protein (min)25.0%
Crude Fat (min)14.0%
Crude Fiber (max)6.9%
Moisture (max)8.0%
Calcium (max)0.9%
Phosphorus (max)0.9%
Magnesium (max)0.06%.
Cat Weight Low Activity Medium Activty High Activty
4.4 lb (2 kg) 1/4 tasse (27 g) 3/8 tasse (34 g) 3/8 tasse (40 g)
6.6 lb (3 kg) 3/8 tasse (36 g) 1/2 tasse (45 g) 5/8 tasse (54 g)
8.8 lb (4 kg) 1/2 tasse (44 g) 5/8 tasse (55 g) 3/4 tasse (66 g)
11 lb (5 kg) 1/2 tasse (51 g) 3/4 tasse (64 g) 7/8 tasse (77 g)
13.2 lb (6 kg) 5/8 tasse (59 g) 3/4 tasse (73 g) 1 tasse (88 g)
Royal Canin Veterinary Diet Feline Urinary SO + Hydrolyzed Protein Dry Cat Food

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Customer reviews

mamafugi
29 Sep 2021

Great product

Our vet recommended we switch to this from another brand and it's been very effective at curing the UTI issues we were having repeatedly. So glad we found it.
jennab
16 Jan 2021

Helped my cat so much

For the last two years I'd say my 5 year old male threw up a "hairball" at least once a month sometimes every day a week depending on the time of year. I thought it was normal especially when it was summer and he was shedding a lot. Then he had a urinary blockage scare a year ago. A few months after that I noticed he was scratching behind his ears so much he was almost bald. I was reading up about food allergies and once I switched him to this food he hasn't thrown up once (3 months now) and his hair is growing back. He's a very picky eater too so I'm so glad he likes it!
Tash
06 Oct 2020

My cat loves it!

When I adopted my cat, the foster said she vomited regularly. My vet recommended a hydrolyzed food. She also has one little kidney, so my vet suggested I try the so + hyrdolyzed and my kitty won’t eat anything else. She’s never vomited and her urine is perfectly concentrated and kidneys doing great. I also have a cat who had a bladder stone removed, as well as a cat with IBD. They can all eat the same food thanks to this stuff! I also feed the one who had the stone the so wet food and he loves it! Wouldn’t feed them anything else.
Jenk
31 Oct 2019

No more crystals!!

[This review was collected as part of a promotion.] I have had cats with struvite crystals which not only created major vet bills but also was extremely scary for myself and my furry family member. Urinary SO has been a ‘God send’. Haven’t had any scares in years since following this diet! I grateful to have piece of mind my felines are healthy and happy with many loving years to come! AND all gobble it up! Thank you Royal Canine! I added a photo from his birthday. Jaime loves his SO, the candle not so much.
mr caramel and mr simba
30 Oct 2019

Helps 2 problems in 1!

[This review was collected as part of a promotion.] Both my cats love it and it helps sensitive tummies and urinary health.
sarmaa
25 Oct 2019

Great for urinary crystals + food sensitivities

[This review was collected as part of a promotion.] It's great that this food exists for cats with urinary crystals/feline idiopathic cystitis AND food allergies/sensitivities. Great product.
willow99
24 Oct 2019

all the cats like it

[This review was collected as part of a promotion.] great choice by vet. was the only one he would eat
Bernie1
22 Oct 2019

Saved my cats life

[This review was collected as part of a promotion.] My cat was not well. Vet recommended so and he has been great since beginning this food. Never buy anything else...its the best.
Bernie1
22 Oct 2019

Saved my cats life

[This review was collected as part of a promotion.] My cat was not well. Vet recommended so and he has been great since beginning this food. Never buy anything else...its the best.
Walley
22 Oct 2019

[This review was collected as part of a promotion.] The only safe food for my elderly kitty to eat. I am grateful it is available