Relative super saturation (RSS) methodology predicts the crystallization potential of urine. RSS is used to develop diets for cats prone to both struvite and oxalate urolithiasis.

Moderate calorie content, 14% less than Feline URINARY SO morsels in gravy, to help maintain ideal weight.

Specially formulated to assist in the management of lower urinary tract disease in cats requiring a moderate fat content, or who are more susceptible to weight gain.

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Labrador Retriever adult sitting with its owner outdoors

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

Calorie Content

This diet contains 658 kcal ME/kg; 56 kcal ME/can on an as fed basis (calculated).

Crude Protein (min)8.0%
Crude Fat (min)1.5%
Crude Fiber (max)2.3%
Moisture (max)84.5%.

Wet Feeding

Body Weight Tendency to be Overweight Ideal Weight
4.4 lbs (2 kg) 1 3/8 cans (114 g) 1 5/8 cans (142 g)
5.5 lbs (2.5 kg) 1 5/8 cans (133 g) 2 cans (167 g)
6.6 lbs (3 kg) 1 3/4 cans (152 g) 2 1/4 cans (190 g)
7.7 lbs (3.5 kg) 2 cans (169 g) 2 1/2 cans (212 g)
8.8 lbs (4 kg) 2 1/4 cans (186 g) 2 3/4 cans (233 g)
9.9 lbs (4.5 kg) 2 3/8 cans (202 g) 3 cans (253 g)
11 lbs (5 kg) 2 5/8 cans (218 g) 3 1/4 cans (273 g)
13.2 lbs (6 kg) 2 7/8 cans (248 g) 3 5/8 cans (310 g)
15.4 lbs (7 kg) 3 1/4 cans (277 g) 4 cans (346 g)
17.6 lbs (8 kg) 3 5/8 cans (305 g) 4 1/2 cans (381 g)
19.8 lbs (9 kg) 3 7/8 cans (331 g) 4 7/8 cans (414 g)
22 lbs (10 kg) 4 1/4 cans (357 g) 5 1/4 cans (446 g)

Mixed Feeding

Cat Weight Cans / Day Low Activity Medium Activty
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 Morsels In Gravy Canned Cat Food

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Customer reviews

28 Aug 2022

New formula

There seems to be a different formula in the urinary SO. My cat doesn’t like it as well as the previous formula. This new case is more watery than the previous purchases. Please change back! Thanks!
22 Jan 2022

Both cats love this

Please bring back in stock and available again to USA! Both my cats love this food more than they do the other brand. I can't find it with any source now
18 Jan 2022

When will this be back in stock? My cat loves it!

I've had my cat on this for a year and she has been consistently enthusiastic about it. Now I can't find it anywhere. Is this a supply chain problem or is it permanently gone?
23 Sep 2021

New formula is HORRIBLE!! Please change back!

What have you done? Are you making a cheaper product now? This new formula is horrible and my cat who desperately needs this food (he’s a stone maker and had to have three removed at once) will not touch this stuff! It’s like mush! Please change it back! He’s a senior cat with kidney and urinary issues and changing his food upset his whole system and cause issues!
28 Jan 2021

No more stones!

My cat was diagnosed with bladder stones about 6 months ago and was put on this food (wet and dry). Not only did she LOVE the food, but now her stones are completely gone! I am so happy with this food.
06 Jan 2021

Kitties love it!

My cat was put on a diet by his vet and he has never been happier! He likes this way better than the regular SO canned food.
22 Nov 2020


My cat Thor depends on this food. Since the formula change, he will not touch it. He has been on this food for nearly a year and absolutely loved it. He had a bad blockage a year ago and nearly had to have surgery. After eating this food along with SO dry food. The stones dissolved and surgery wasn’t needed. He loved the gravy in this food. But now he smells it and meows at me to fix it and I can’t. He then walks away. I don’t understand why when you have a product that is working so well and that everyone is so happy with. Why would you then make changes to this. Especially when this is a prescribed food. No warning was sent out to owners. Some I’ve read now have sick animals. I’m now concerned about Thor eating the SO dry food, is it safe. We have been loyal RC customers for 8 years and now I’m concerned, I will have to start looking for another pet food manufacturer for my cat. I have to feed him specialized food and he has to eat it. He won’t eat the new formula at all! This is a major issue! The new formula isn’t gravy anymore, it’s watery and oily looking. My cat is obsessed with rue this food and now it’s ruined. What am I supposed to feed him now??