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Sacred Birman kitten stood next to an adult Yorskhire Terrier in black and white.
Vet Products

Helps dissolve pure struvite stones and helps prevent calcium oxalate stones

Moderate calorie content (10% less calories than Royal Canin Feline Urinary SO dry cat food) for ideal weight maintenance

Lowers the risk of crystal formation using RSS methodology for bladder health

Supports urinary health with an exclusive S/O Index, and creates an environment unfavorable to crystal formation in the bladder

When your cat 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 cat food was developed to nutritionally support your adult cat’s urinary tract and bladder health. It increases the amount of urine your cat produces to help dilute excess minerals that can cause crystals and stones. Moderate calorie content (10% less than Royal Canin Urinary SO dry cat 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 cats. Talk to your veterinarian about keeping your cat on this urinary cat food for long-term urinary support. And ask them about the right Royal Canin wet cat food and treats to complement your cat’s diet.

Chicken by-product meal, brewers rice, corn, corn gluten meal, powdered cellulose, wheat gluten, natural flavors, chicken fat, salt, fish oil, potassium chloride, calcium sulfate, egg product, sodium bisulfate, vegetable oil, sodium pyrophosphate, DL-methionine, fructooligosaccharides, monocalcium phosphate, choline chloride, 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], taurine, trace minerals [zinc proteinate, zinc oxide, manganese proteinate, ferrous sulfate, manganous oxide, copper sulfate, calcium iodate, sodium selenite, copper proteinate], marigold extract (Tagetes erecta L.), L-carnitine, rosemary extract, preserved with mixed tocopherols and citric acid.

Calorie Content

This diet contains 3277 kilocalories of metabolizable energy (ME) per kilogram or 275 kilocalories ME per cup on an as fed basis (calculated).

Crude Protein (min) 32.0%
Crude Fat (min) 9.0%
Crude Fiber (max) 9.3%
Moisture (max) 8.0%
Glucosamine* (min) 1425 mg/kg

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

Dry Feeding

Cat Weight Low Activity Medium Activity
4.4 lb (2 kg) 3/8 cup (29 g) 3/8 cup (36 g)
6.6 lb (3 kg) 1/2 cup (39 g) 5/8 cup (49 g)
8.8 lb (4 kg) 5/8 cup (48 g) 3/4 cup (60 g)
11 lb (5 kg) 5/8 cup (56 g) 7/8 cup (70 g)
13.2 lb (6 kg) 3/4 cup (64 g) 1 cup (80 g)
15.4 lb (7 kg) 7/8 cup (71 g) 1 cup (89 g)
17.6 lb (8 kg) 7/8 cup (78 g) 1 1/8 cups (98 g)

Mixed Feeding

Cat Weight Cans / Day Low Activity Medium Activity
4.4 lb (2 kg) 1 1/8 cup (10 g) 1/4 cup (19 g)
6.6 lb (3 kg) 1 1/4 cup (20 g) 3/8 cup (32 g)
8.8 lb (4 kg) 1 3/8 cup (29 g) 1/2 cup (44 g)
11 lb (5 kg) 1 1/2 cup (37 g) 5/8 cup (56 g)
13.2 lb (6 kg) 1 1/2 cup (45 g) 3/4 cup (67 g)
15.4 lb (7 kg) 1 5/8 cup (52 g) 7/8 cup (77 g)
17.6 lb (8 kg) 1 3/4 cup (59 g) 1 cup (87 g)
Royal Canin Veterinary Diet Feline Urinary SO Moderate Calorie Dry Cat Food

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Customer reviews

22 Jun 2019

It Works!

Our 4 year old rescue Oscar had been under a LOT of stress as we moved our family from Hawaii to WV last month. Shortly after the move, we realized he was crying in his box and straining to go. Rushed him to the ER vet and he was blocked. A few days hospitalization, meds and a switch to Royal Canin Urinary SO wet and dry foods, and I'm thrilled to say our playful boy is back!
Jojo is happy
18 May 2019

Jojo's fav food

Jojo did have a urinary problem. So our vet recommended this food. Ever since my cat is doing great! I went ahead and had both of my cats eat it. They get along and play (they were fighting). So I am more at ease; less stress. Fur coat is much softer. The result: two happy healthy cats! :)
Royal Canin response
Great to hear!
Fiona and family
01 Dec 2018

Saved my little lady

We adopted our Maine Coon mix Fiona from the local shelter in March 2018. She lived on the streets for who knows how long, then the shelter, so we don't know anything about her life before us. August 2018 she started having accidents around the house and she was in a lot of pain. I took her to the vet and he suspected crystals/stones since we didn't know her history. Thankfully it was just crystals. Within 3 days of eating Royal Canin Urinary SO dry food, she was back to herself. Royal Canin saved our little lady from a life of urinary pain.
Royal Canin response
The tongue photo is hilarious!
11 Nov 2018

My cat likes it

I’m happy with the cat food. My cat hasn’t been sick Since
08 Nov 2018

Veterinarian- Excellent results!

As a practicing veterinarian, I see my fair share of overweight, blocked male cats. This is a superb diet and I highly recommend for my patients with known urinary conditions such as stones. See before and after pictures simply 30 days on the RC Feline S/O Mod. Cal diet--remarkable!
Royal Canin response
Wonderful feedback, thank you so much for sharing your experience
06 Nov 2018

Great Taste and Controls Weight!

My cats love the taste of this food and it helps to control their weight. Indoor cats just don't get as much exercise as they should and tend to put on weight. With this Royal Canin Feline Urinary SO Moderate calorie they are doing great!
Jennifer LJ
06 Nov 2018

Great taste!

My male cats have not had any bladder stone issues since being on this food! My vet said it was a great food to have my male kitten on too. I volunteer at our local animal shelter and have been able to recommend this product to others to try. My cats love the taste of this food!
06 Nov 2018

Great name definitely is informative

Been using this for about 3 years. This food definitely help saved my cat and has help him lose a little more then a pound.
05 Nov 2018

Great product

I was skeptical of starting another prescription diet; however I was desperate to find some way to help reduce the number of UTIs my cat was contracting. It's expensive but if it keeps working, it's well worth it.
Mom to Two Cats
05 Nov 2018

cats love it!

Both my cats love this food. The big boy (with the crystals problem) empties his dish and his feeding toy. The little girl (no crystals) also empties her dish. I feed both wet and dry food to my cats. The smaller bag is just the right size to keep the product fresh.