Royal Canin Veterinary Diet Urinary SO Dry Cat Food

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17.6-lb bag
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Lower urinary tract disease (LUTD) refers to a group of disorders that commonly leads to irritation of the urinary tract and corresponding undesirable clinical signs. What causes Lower Urinary Tract Disease? In cats, bacterial infections are far less common. Urinary crystals and stones are often linked to this disease. The most common cause of Lower Urinary Tract Disease in cats is idiopathic cystitis. This diet promotes a urinary environment unfavorable to the development of both struvite and calcium oxalate crystals.

Key Benefits

  • Feline Urinary SO is a complete and balanced diet for adult cats to aid in the nutritional management of calcium oxalate and struvite urolithiasis, recommended for cats at risk of developing lower urinary tract disease
  • Provides nutrition that aids in the management of pure struvite uroliths.
  • Royal Canin Urinary SO Index® promotes a urinary environment unfavorable to the development of both struvite and calcium oxalate crystals
  • Increasing the urine volume simultaneously reduces the saturation of urine with calcium oxalate and struvite crystals
  • Relative Super Saturation (RSS) methodology predicts the crystallization potential of urine; RSS is used to develop diets that lower the concentration of ions contributing to struvite and calcium oxalate urolithiasis

Note: Royal Canin Veterinary Diets require a veterinary prescription. This product will not be shipped until a copy of a valid prescription authorization is faxed to 1-800-619-7973 or e-mailed to

See all items by Royal Canin Veterinary Diet

  • Item Number
  • Weight
    17.6 pounds
  • Brand
    Royal Canin
  • Food Form
    Dry Food
  • Lifestage
  • Made in
    United States
  • Special Diet
    Prescription Food

Nutritional Info


  1. Chicken-by Product Meal, Brewers Rice, Corn Gluten Meal, Corn, Chicken Fat, Natural Flavors, Soy Protein Isolate, Powdered Cellulose, Salt, Egg Product, Brewers Dried Yeast, Potassium Chloride, Calcium Sulfate, Fish Oil, Sodium Bisulfate, Vegetable Oil, Taurine, Choline Chloride, Dl-Methionine, 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), Folic Acid, Vitamin B12 Supplement, Vitamin D3 Supplement], Marigold Extract (Tagetes Erecta L.), Trace Minerals [Zinc Oxide, Zinc Proteinate, Ferrous Sulfate, Manganese Proteinate, Copper Proteinate, Copper Sulfate, Manganous Oxide, Calcium Iodate, Sodium Selenite], Rosemary Extract, Preserved with Mixed Tocopherols and Citric Acid.

Caloric Content

  1. 3,631 kcal/kg, 298 kcal/cup
Guaranteed Analysis
Crude Protein 32.5% min
Crude Fat 13.5% min
Crude Fiber 4.5% max
Moisture 9.5% max
Magnesium 0.08% max

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Customer Reviews

Rated 4.8 out of 5 by 680 reviewers.
Rated 5 out of 5 by Chewy Is my choice from now on no more going to the store to find out they are out of it My cat was going outside the box I found out she had Kidney problems. This product fixed that and she has not gone outside the box for over four years now. This is the only food she gets other than one can of wet food and same brand (yes they carry the wet stuff as well) a week which I add more water to it. You need a script for this but your vet will give you one if it is found that your kitty needs it. I was going to the store to pick this up but I was running low on it and the store said they did not know when it would be in. So I came home checked on line and found Wow!!! It comes right to my door! LOVE it no more guessing or calling to find out if it is in stock just order and it comes what more can you ask for well the cost is cheaper here as well. Wish I would have done this 4 years ago so much better than going to the store having to carry it to the car then into the house. I am happy and so is my Kitty. Before she started on this I thought I would have to get rid of her but now all is well she is going in the box and not screaming in pain happy Kitty. November 28, 2016
Rated 5 out of 5 by Urinary SO food Chewy has the best pricing on this food. It's pricey but is so much cheaper than a vet visit. Max really likes this food and seems to have cleared up his blockage problem. Chewy delivered quickly! Thanks! January 13, 2017
Rated 5 out of 5 by Vet recommended Our vet recommended this particular one for our kitty’s urinary track problems. This special dry food seems to work the best for the urinary health; few people had told me that the same type of dry food from Science Diet didn’t work at all. It’s about a couple of months has passed since we had started feeding our kitty this special food, and fortunately, he seems to be almost back to normal. We are going to continue feeding this for several more months to be sure. This product is quite expensive to us, and we were lucky that we had a 20% discount coupon, which is a lot, compare to purchasing exact the same one at the vet office. Actually, we had a hard time finding this particular product online. We were very pleased when we found out that our favorite online pet store carries this one! Thank you very much, CHEWY! November 27, 2016
Rated 4 out of 5 by Expensive, but worth it. Our vet prescribed this product for our cats, one a senior and the other a young adult. The digestive problem cleared up and the cats are much more active. Their coats look better,too. Actually, one bag costs less than what we were paying for canned food. Chewy appears to be a good service that will save money and increase convenience. January 11, 2017
Rated 5 out of 5 by Recommended by my vet Two of my male cats have crystals in their urine. This food was prescribed by my vet and it seems to be helping them with their condition! January 11, 2017
Rated 5 out of 5 by This food works miracles Both of my cats were having urinary issues and we're on several prescribed medications from the veterinarian and the problems were not being resolved. So we decided changing their diet was worth a shot and changed to the SO diet. Not only do both cats love the food more than the blue buffulo I was feeding them before, they have not had any urinary problems since switching. Their urine output is very good and they are not having any difficulty urinating. Problems resolved with a simple diet change. I recommend this food! December 29, 2016
Rated 5 out of 5 by Great prescription food This has kept my cat healthy for years. He's. been on Royal Csnin Urinary SO since he was a kitten. He's now 16 January 11, 2017
Rated 5 out of 5 by It Works This food is dissolving struvrite bladder stones in my cat. All of my 5 cats like it. January 9, 2017
  • 2017-01-16 T06:15:21.428-06:00
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