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Royal Canin Veterinary Diet Urinary SO Dry Cat Food

List Price: $75.39
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17.6-lb bag
  • 7.7-lb bag
  • 17.6-lb bag

Product Description

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

  • Recommended for cats at risk of developing lower urinary tract disease
  • Dissolution of pure struvite uroliths
  • Help prevent struvite, calcium oxalate and phosphate uroliths
  • Provides nutrition that aids in the management of pure struvite uroliths
  • 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
  • Increasing the urine volume simultaneously reduces the saturation of urine with calcium oxalate and struvite crystals
  • Reduced level of magnesium, a natural component of struvite stones

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 49988
Weight 17.6 pounds
  • Royal Canin
  • Adult
Special Diet
  • Prescription Food
Food Form
  • Dry Food
Country of Origin
  • United States

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Important Information


Chicken 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.

Customer Ratings & Reviews

Rated 4.8 out of 5 by 428 reviewers.
Rated 5 out of 5 by BETTER THAN I COULD HAVE THOUGHT! These guys are incredible...NOT ONLY 2day turnaround with food that needed a vet call for a script..... But..I GOOFED AND ORDERED THE WRONG FOOD. So I called asking if I could return and exchange.. In two seconds, they had the exchange arrange, and told me to not return the FIRST one, but donate it to a shelter..I asked them to repeat that..I couldn't believe it! My local shelter thanks you, I thank you.. I LOVE THAT YOU GIVE BACK (not to me, to donate) You have my undying affection,,and I have a REALLY big mouth...I have been doing lots if marketing for you! BUY FROM THESE FOLKS..,, Thank u, chewy July 8, 2013
Rated 4 out of 5 by It Works! I have 5 cats with vet-handled urinary issues, mostly involving crystals. None have had urinary problems while being on this food...some for years. I read where sometimes owners take their cats off this food after they have been problem-free for a while - thinking they are cured. Crystals can be life-threatening (as in blockages) and this food keeps them from forming. They will form again if this food is stopped. Also, I have been told by the vet not to feed it to my cats that don't have urinary issues. Cats who don't form crystals can be messed up by the ph balancing ingredients in this formula. December 31, 2012
Rated 5 out of 5 by Same product; much better price The vet put my cat, now 12, on this product several years ago as she was having trouble passing stool. It has worked well and she likes it. It does make them drink a lot so it is important to provide plenty of fresh water.I have been purchasing it from the vet until my last visit when the price had TRIPLED. That's when I found it at this web site for a much more reasonable price. I got two bags to avoid shipping costs. I tried another urinary product from the pet store but my cat wouldn't touch it. March 22, 2012
Rated 5 out of 5 by The BEST urinary diet out there! I've been using this food for at least 5 years now. I found it by doing my own research on line and asked my vet if he could order it. My Manx cat used to get struvites about every 7-8 months; then he began also getting oxalates along with the struvites. My vet had been prescribing Hill's, but my cat hated it (and he'll eat anything) -- plus he still continued getting the problems every 7-8 months. This was the only food I could find that took care of *both* struvites and oxalates. The best part is my cat LOVES this food! He goes after it like it's a delicious treat. It certainly smells much better than Hill's! Knock on wood ... ever since I've been feeding him this food with a bit of Wellness canned mixed in, he has had no further problems!! Miraculous! I very highly recommend this excellent food. It has kept my cat much healthier and happier -- and as a bonus has saved a lot of vet bills! February 25, 2012
Rated 5 out of 5 by No More Crystals!! My neutered cat Giovanni had crystals in his urine a couple of years ago and this was on a Friday evening when the vets office was closed so I took him to the animal emergency. A 3-day stay and $1,200.00 bill my boy came home feeling much better. When he got home I took him to our regular vet and the paperwork with Gio's weekend adventure. He put Gio on Royal Canin Veterinary Diet SO Dry Cat food and there have been no more incidents for this sweet boy. Sooo worth it to spend more on the food then a vet/hospital bill as you can see. This food is magic! Mr. Chewy price is the same price as our vet but on here I get auto delivery I don't have to make a trip there and wait in line to get it and lug it home. So glad I found Mr Chewy website! August 24, 2012
Rated 3 out of 5 by Good, but could be better The food seems to be working for my kitty so far. The ingredients in this food, however, could be improved. I feel like I am paying for the name and one or two specific ingredients (to control the pH of my cat's urine), but for this price, Royal Canin could invest a bit more in higher quality ingredients overall. December 2, 2014
Rated 5 out of 5 by You guys rock! One of my nine cats has to have this food to keep his current kidney/bladder issues at bay, so I have to buy this in bulk for ALL of them. It was becoming a real logistical problem getting to the vet every few weeks so they didn't run out, and since he cannot eat anything else for fear of health problems, it was always on my mind. Your website and delivery service have taken care of this problem for us. I no longer stress about my furkids running out of their medically necessary food. THANK YOU from all my kids! Tigre, Chloe, Miklo, Vincenzo, Giovanni, Sofia, Sidney, Santino and Isabela Stafford, VA February 14, 2012
Rated 5 out of 5 by product lived up to its claims This product was prescribed by my vet for a cat w/urinary problems. My cat is very healthy with a beautiful coat, a good weight and no urinary problems. What is more, my cat enjoys eating it and will choose it over the food my other cats eat. Although pricey, the food is worth the money. January 12, 2013
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Questions? Call our friendly customer service team anytime. We're here 24 hours a day! 1-800-67-CHEWY (672-4399)