HELPS DISSOLVE STONES: Innovative urinary tract cat food helps dissolve pure struvite stones and helps prevent calcium oxalate stones

BLADDER HEALTH: Lowers the risk of crystal formation using RSS methodology for cat bladder health

S/O INDEX: The exclusive S/O Index creates an environment unfavorable to crystal formation in the bladder to support urinary health

HELPS PREVENT STONE REOCCURANCE: Specialized diet, with a reduced level of magnesium, helps prevent struvite stones from reoccurring

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. 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. And this specialized nutrition, with a reduced level of magnesium, helps dissolve pure struvite stones and prevent struvite stones from forming. 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.

Working towards a sustainable future

Our belief that pets make our world better inspires and gives life to our purpose of making a better A BETTER WORLD FOR PETS ™

Discover more
Labrador Retriever adult sitting with its owner outdoors
Recyclability Content Block

Where to recycle your Royal Canin packaging?

Explore your local options.

Discover more
ContentBlockDailyPortion

Discover our tool that calculates the daily portion for your pet. Fill in your pet's information and you will get their daily feeding recommendation. In case of weight issues, do not hesitate to consult your vet to adapt this portion. Note that this feeding recommendation is more precise than the feeding table, therefore the values may slightly differ.

Calculate

Chicken by-product meal, brewers rice, corn, corn gluten meal, chicken fat, wheat gluten, natural flavors, wheat, salt, powdered cellulose, fish oil, potassium chloride, sodium bisulfate, calcium sulfate, sodium pyrophosphate, vegetable oil, fructooligosaccharides, 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], DL-methionine, taurine, monocalcium phosphate, 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.), rosemary extract, preserved with mixed tocopherols and citric acid.

Calorie Content

This diet contains 3659 kilocalories of metabolizable energy (ME) per kilogram or 315 kilocalories ME per cup on an as fed basis (calculated).

Nutrient Amount
Crude Protein (min)32.5%
Crude Fat (min)13.0%
Crude Fiber (max)4.0%
Moisture (max)8.0%
Calcium (max)1.26%
Phosphorus (max)1.26%
Magnesium (max)0.1%.

Dry Feeding

Cat Weight Low Activity Medium Activity High Activity
4.4 lb (2 kg) 1/4 cup (26 g) 3/8 cup (33 g) 1/2 cup (39 g)
6.6 lb (3 kg) 3/8 cup (35 g) 1/2 cup (44 g) 5/8 cup (52 g)
8.8 lb (4 kg) 1/2 cup (43 g) 5/8 cup (53 g) 3/4 cup (64 g)
11 lb (5 kg) 5/8 cup (50 g) 3/4 cup (63 g) 7/8 cup (75 g)
13.2 lb (6 kg) 5/8 cup (57 g) 7/8 cup (71 g) 1 cup (85 g)

Mixed Feeding

Cat Weight Cans / Day Low Activity Medium Activity High Activity
4.4 lb (2 kg) 1/2 1/4 cup (16 g) 1/4 cup (24 g) 3/8 cup (30 g)
6.6 lb (3 kg) 1 1/8 cup (15 g) 1/4 cup (26 g) 3/8 cup (35 g)
8.8 lb (4 kg) 1 1/4 cup (23 g) 3/8 cup (37 g) 1/2 cup (48 g)
11 lb (5 kg) 1 3/8 cup (31 g) 1/2 cup (47 g) 3/4 cup (60 g)
13.2 lb (6 kg) 1 3/8 cup (37 g) 5/8 cup (57 g) 7/8 cup (72 g)
Urinary SO Dry Cat Food

Still have questions about this product?

Find out how to reach us, and get in touch.

Ask a question

Customer reviews

Kitty and dog mom 4
12 Apr 2024

Cost too much

I started buying this product in 2018 after my cat had urinary issues. At the time the 17lb bag was $62, it’s now $112. The price increase is beyond ridiculous. I feel trapped because I have no choice but to purchase for the health of my cat. It works great for him but financially a hardship for me.
KellyChaison
28 Jan 2024

SO saves our vet bills

We have been using Urinary SO for 10 years, we live out in rural Virginia where a lot of cats show up as abandoned so we take them in since the shelters are full. All the cats have to eat the SO so it gets rather expensive, but less expensive then the kitties getting bladder issues. Help can we buy SO by the pallet?
CJB1
10 Jan 2024

Recent Formula Change is BAD

Why was this formula recently changed??! My cat has been on this over a decade and now suddenly you add egg product and he's puking it up and allergic to it. CHANGE IT BACK.
MaxC
05 Jan 2024

Urinary-SO-gold-colored cat vomit everywhere

To add to the other 1-star reviews on vomiting, my cat has been on USO for many years and with the most recent batch (bought in late 2023) began vomiting it up daily. He has no other symptoms and is otherwise happy and normal, so I do heavily suspect that it's the RC USO. It's also a very expensive food. I will seek another brand because I'm tired of doing laundry washing sofa and chair covers of Royal Canin Urinary-SO-gold-colored cat vomit.
milo1996
01 Jan 2024

Vomit

My cat has been on this food for a couple months with no issues, however recently he has been vomiting every 2-3 days. After looking up if this is common with this brand of dry food I found it very much is. Something is off with this food, you can see every piece of kibble in his vomit which tells me it’s not being digested properly. I never had any issues with this when he was on Tiki Cat, unfortunately I had to switch due to urinary issues.
Kitty1
02 Nov 2023

Expensive but good

My cat has been on the SO FOOD ..kitty has kidney disease
Kennedy mom
30 Sep 2023

HeatherH
21 Aug 2023

You'll be glad you did!

Our tuxedo, Sylvester, has been on RC Urinary SO Dry Cat Food for a few months. He's had a Blocked Tom twice now. The last episode was quite concerning and costly. He took to this catfood right away and hasn't had any issues since.
Royal Canin response
We are very happy to hear that our product has worked great for your cat. Thank you!
Mybubbles
31 Jul 2023

Does not Work

My cat has struvite crystals and was prescribed this. He was using his litter box about 20 times a day before being put on this food due to the crystals. He has been on this food exclusively for a few weeks and is still using the litter box about 20 times a day. It is not working and cost a fortune. I do not recommend.
Rcmann
28 Jun 2023

Great package information and it has three langua

My cat loves it is it have alfalfa in it my vet recommend it for my cat