Helping cats and dogs live their healthiest lives.
Sacred Birman kitten stood next to an adult Yorskhire Terrier in black and white.
Vet Products

Hydrolyzed protein, composed of low molecular weight peptides, is highly digestible and minimizes signs associated with food sensitivities.

Founded by a veterinarian, Royal Canin has over 40 years experience in Health Nutrition. Our work with veterinarians, pet nutritionists, breeders and cat professionals from around the world has provided us with knowledge about the specific nutritional requirements of cats. This knowledge has allowed us to formulate the precise diet for your cat's special needs.

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, calcium iodate], 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) 7.4%
Moisture (max) 8.0%

Cat Weight Low Activity Medium Activity High Activity
4.4 lb (2 kg) 1/4 cup (27 g) 3/8 cup (34 g) 3/8 cup (40 g)
6.6 lb (3 kg) 3/8 cup (36 g) 1/2 cup (45 g) 5/8 cup (54 g)
8.8 lb (4 kg) 1/2 cup (44 g) 5/8 cup (55 g) 3/4 cup (66 g)
11 lb (5 kg) 1/2 cup (51 g) 3/4 cup (64 g) 7/8 cup (77 g)
13.2 lb (6 kg) 5/8 cup (59 g) 3/4 cup (73 g) 1 cup (88 g)
Royal Canin Veterinary Diet Feline Urinary SO + Hydrolyzed Protein Dry Cat Food

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Customer reviews

31 Oct 2019

No more crystals!!

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!

Both my cats love it and it helps sensitive tummies and urinary health.
29 Oct 2019

25 Oct 2019

Great for urinary crystals + food sensitivities

It's great that this food exists for cats with urinary crystals/feline idiopathic cystitis AND food allergies/sensitivities. Great product.
24 Oct 2019

all the cats like it

great choice by vet. was the only one he would eat
24 Oct 2019

22 Oct 2019

Saved my cats life

My cat was not well. Vet recommended so and he has been great since beginning this food. Never buy anything else...its the best.
22 Oct 2019

Saved my cats life

My cat was not well. Vet recommended so and he has been great since beginning this food. Never buy anything else...its the best.
22 Oct 2019

The only safe food for my elderly kitty to eat. I am grateful it is available
22 Oct 2019

Easy to use

I have used this since my kitties were babies. My female had definite urinary tract problems, and my male a few crystals in urine. They have thrived on this product and now 5 years old . ( Both neutered, and total indoor cats). Vet suggested another brand, but these two would not eat it. Immediately back to Royal Canin.