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

Helps dissolve pure struvite stones and helps prevent calcium oxalate stones

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

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 loaf in sauce wet 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 dry cat food and treats to complement your cat’s diet.

Water sufficient for processing, pork by-products, pork liver, chicken by-products, chicken liver, chicken, pork plasma, powdered cellulose, wheat flour, natural flavors, wheat gluten, calcium sulfate, salt, fish oil, carob bean gum, carrageenan, potassium chloride, sodium tripolyphosphate, xanthan gum, taurine, sodium bisulfate, DL-methionine, vitamins [DL-alpha tocopherol acetate (source of vitamin E), thiamine mononitrate (vitamin B1), biotin, niacin supplement, D-calcium pantothenate, folic acid, pyridoxine hydrochloride (vitamin B6), riboflavin supplement, vitamin B12 supplement, vitamin D3 supplement], marigold extract (Tagetes erecta L.), trace minerals [zinc oxide, zinc proteinate, ferrous sulfate, calcium iodate, copper sulfate, manganous oxide, sodium selenite].

Calorie Content

This diet contains 820 kcal ME/kg; 135 kcal ME/can on an as fed basis (calculated).

Water sufficient for processing, pork by-products, chicken liver, chicken, corn flour, chicken by-products, powdered cellulose, dried egg product, calcium sulfate, guar gum, potassium chloride, salt, natural flavors, carrageenan, fish oil, taurine, sodium tripolyphosphate, vitamins [DL-alpha tocopherol acetate (source of vitamin E), thiamine mononitrate (vitamin B1), niacin supplement, biotin, D-calcium pantothenate, riboflavin supplement (vitamin B2), pyridoxine hydrochloride (vitamin B6), vitamin B12 supplement, folic acid, vitamin D3 supplement], trace minerals (zinc proteinate, zinc oxide, ferrous sulfate, manganous oxide, sodium selenite, calcium iodate), marigold extract (Tagetes erecta L.).

Calorie Content

This diet contains 863 kilocalories of metabolizable energy (ME) per kilogram or 142 kilocalories ME per 5.8 oz can on an as fed basis (calculated).

Crude Protein (min)10.5%
Crude Fat (min)2.5%
Crude Fiber (max)2.0%
Moisture (max)81.0%.

Wet Feeding

Cat Weight Low Activity Medium Activity High Activity
4.4 lb (2 kg) 3/4 can (105 g) 3/4 can (135 g) 1 can (160 g)
6.6 lb (3 kg) 3/4 can (140 g) 1 can (180 g) 1 1/4 cans (215 g)
8.8 lb (4 kg) 1 can (175 g) 1 1/4 cans (220 g) 1 1/2 cans (260 g)
11 lb (5 kg) 1 1/4 cans (205 g) 1 1/2 cans (255 g) 1 3/4 cans (305 g)
13.2 lb (6 kg) 1 1/2 cans (235 g) 1 3/4 cans (290 g) 2 cans (350 g)
17.6 lb (8 kg) 1 3/4 cans (285 g) 2 1/4 cans (360 g) 2 1/2 cans (430 g)

Mixed Feeding

Cat Weight Cans / Day Low Activity Medium Activity High Activity
4.4 lb (2 kg) 1/4 1/8 cup (16 g) 1/4 cup (23 g) 3/8 cup (30 g)
6.6 lb (3 kg) 1/2 1/8 cup (15 g) 1/4 cup (25 g) 3/8 cup (34 g)
8.8 lb (4 kg) 1/2 1/4 cup (23 g) 3/8 cup (36 g) 1/2 cup (47 g)
11 lb (5 kg) 1/2 3/8 cup (30 g) 1/2 cup (46 g) 3/4 cup (60 g)
13.2 lb (6 kg) 1/2 3/8 cup (37 g) 5/8 cup (56 g) 7/8 cup (71 g)
17.6 lb (8 kg) 1 3/8 cup (30 g) 5/8 cup (54 g) 7/8 cup (73 g)

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Customer reviews

12 Feb 2021

Worked on my kitty

Here's my, or his, story. I feed my cats wet Ziwipeak. Went to clean the litterbox and there was blood in his pee. The did testing at the vet and turns out he's got crystals. They prescribed this (or Hills) and I have to admit, I fed him the RC 70% and Ziwi 30% in a day. I love Ziwi and the quality ingredients and I was upset about having to give that up, plus he was losing weight on the RC too. Thirty day check-up he was good and no crystals. About a month later he was having trouble holding it in and I noticed small red spots. Took him back, got scolded a bit by the doctor and was told he needs to be only on diet food. He can have one treat a day but no more Ziwi as it created high a PH balance. She said it's not from Ziwi but his body is changing to senior age and we all know what that does to us. So I had to stick to the RC, with dry food added in to keep his weight up cause he's a big cat, and with the next vet check he was clear of crystals. That last vet appt was a month ago and all seems fine now but for the minor incontinences he experiences. I put puppy pads outside the litterbox for that. He has also had minor issues though, being diagnosed with IBS many years ago. All cats are different and even though I don't like the ingredients in this food it does work, at least for my kitty. Now let's talk about my how this affects my bank account lol...
08 Feb 2021

It really works

I don't understand all of the bad reviews. My kitty is prone to crystals and after just one day on this food she started peeing normally again. Prior to this food, she would visit the litter box dozens of times a day and just sit and strain for up to 5 minutes. I'll continue to give her this food as long as she will eat it!
29 Jan 2021

I wish I could give it 0 stars.

My vet recommended this food for my cat who is prone to crystals in her urine and UTI's. I bought 12 cans from my vet about a month ago and apparently those cans contained the original formula. I received 24 cans from a different distributor today and my cat will not touch this food now. Normally, I would take the time to gradually switch my cat to a new food if she doesn't seem immediately interested in it but I am very hesitant considering that most of these reviews say that the new formula made their cat(s) vomit. I am super disappointed. I will be switching to a different brand.
28 Jan 2021

Deborah C
30 Nov 2020

Dried out

My cat will no longer eat this product. You changed the formula and now it is dried out. Will find another company
jacqueline 62
18 Nov 2020

refused to eat after 3 yrs on this diet

My cat has been on this food for 3 years and now he refuses to eat sniffs and runs away. What did you do to the formula... will be going to vet to change his diet.. awful
30 Aug 2020

Royal canin urinary so

I bought this food for my cat and every time he eats a little of it he throws it back up
15 Aug 2020


Bought a few cans from the vet because my cat was just diagnosed with urinary crystals. Within minutes of eating this wet food she vomited all over. Dinner that night I gave it to her again not realizing it was the food. Again within minutes she vomited it all up! I had another brand - Hills C/D and I gave her that and she ate it just fine. The next morning I tried the Royal Canin again and bam - vomited all over. Will never feed this food again! Gave her the hills c/d and she's been fine for days now - no vomiting.
11 Aug 2020

Cat's health decreasing while price increasing

I wish you hadn't changed the formula. We rescued a special needs kitty from the shelter 4 years ago and this food was her prescribed diet, which was the green label at that time. Since the formula change my cat's health is declining, she's losing weight, and shedding fur like crazy. All the while, the price has gone up significantly - it's now about double what it cost when we first adopted her. I will be asking the vet for another option for her food. The only OK thing at this point is that my cat doesn't seem to mind the change in flavor/texture (we have always mixed water in with her food from the beginning when she was eating the green label version) but it sounds like we are lucky in that regard. Please listen to your customers and change it back to the original formula.
23 Jul 2020

sick cats

I have a boy cat and his sister on S/O dry and wet loaf and wet morsels and they have had it for maybe 2 years. At about February I noticed deterioration in both of them: fur shabby, losing weight, itchy skin. I suspected everything in my house like fumes or the pet condos or furniture covers so I threw out just about everything. They continue to deteriorate. I am checking with my vet about switching to another brand now that I've seen so many complaints. Shocking.