Royal Canin Veterinary Diet Urinary SO Dry Dog Food

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25.3-lb bag
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  • 25.3-lb bag
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This prescription item requires vet approval. Details


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 dogs, bacterial infections of the urinary tract and the presence of stones (uroliths) in the urinary tract are the most common causes. This diet promotes a urinary environment unfavorable to the development of both struvite and calcium oxalate crystals.

Key Benefits

  • Canine Urinary SO is a complete and balanced diet for adult dogs formulated to aid in the nutritional management of calcium oxalate and struvite urolithiasis.
  • Reduced magnesium level supports urinary health
  • Royal Canin Urinary SO Index® promotes a urinary environment unfavorable to the development of both struvite and calcium oxalate 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
  • Increasing the urine volume simultaneously reduces the saturation of urine with calcium oxalate and struvite crystals

This product requires a veterinary prescription. Simply provide your vet's information during checkout and we'll follow up to confirm the prescription, or email a copy of your prescription to rx@chewy.com and we'll get your order out right away.

See all items by Royal Canin Veterinary Diet

  • Item Number
  • Weight
    25.3 pounds
  • Brand
    Royal Canin
  • Breed Size
    All Breeds, Small Breeds, Medium Breeds, Large Breeds
  • Food Form
    Dry Food
  • Lifestage
  • Made in
    United States
  • Special Diet
    Prescription Food

Nutritional Info


Brewers Rice, Corn, Chicken Fat, Chicken Meal, Natural Flavors, Egg Product, Corn Gluten Meal, Salt, Powdered Cellulose, Potassium Chloride, Fish Oil, Calcium Carbonate, Potassium Phosphate, Calcium Sulfate, Taurine, Choline Chloride, Vitamins [Dl-Alpha Tocopherol Acetate (Source of Vitamin E), Biotin, D-Calcium Pantothenate, Pyridoxine Hydrochloride (Vitamin B6), Vitamin A Acetate, Niacin Supplement, Thiamine Mononitrate (Vitamin B1), Riboflavin Supplement, Folic Acid, Vitamin B12 Supplement, Vitamin D3 Supplement], Marigold Extract (Tagetes Erecta L.), Trace Minerals (Zinc Oxide, Ferrous Sulfate, Zinc Proteinate, Manganese Proteinate, Copper Sulfate, Manganous Oxide, Copper Proteinate, Calcium Iodate, Sodium Selenite), Rosemary Extract, Preserved with Mixed Tocopherols and Citric Acid.

New Formula: Brewers Rice, Corn, Chicken By-Product Meal, Chicken Fat, Natural Flavors, Egg Product, Powdered Cellulose, Salt, Corn Gluten Meal, Potassium Chloride, Monocalcium Phosphate, Calcium Carbonate, Calcium Sulfate, Vitamins [Dl-Alpha Tocopherol Acetate (Source of Vitamin E), Biotin, D-Calcium, Pantothenate, Vitamin A Acetate, Pyridoxine Hydrochloride (Vitamin B6), Pyridoxine Hydrochloride (Vitamin B6), Niacin Supplement, Folic Acid, Thiamine Mononitrate (Vitamin B1), Vitamin B12 Supplement, Riboflavin Supplement, Vitamin D3 Supplement, Choline Chloride, Trace Minerals [Zinc Proteinate, Zinc Oxide, Ferrous Sulfate, Manganese Proteinate, Manganous Oxide, Copper Sulfate, Calcium Iodate, Sodium Selenite, Copper, Proteinate], Taurine, Marigold Extract (Tagetes Erecta L.), Rosemary Extract, Preserved with Mixed Tocopherols and Citric Acid.

Caloric Content

3,649 kcal/kg, 288 kcal/cup

Guaranteed Analysis
Crude Protein 14.0% min
Crude Fat 14.0% min
Crude Fiber 4.7% max
Moisture 10.0% max
Magnesium 0.08% max

Feeding Instructions

Weight Daily Feeding for Weight Loss (cups) Daily Feeding for Maintenance (cups)
4 lbs 1/2 5/8
11 lbs 1 1 1/4
22 lbs 1 3/4 2
33 lbs 2 3/8 2 3/4
44 lbs 3 3 1/2
55 lbs 3 1/2 4 1/8
66 lbs 4 4 3/4
77 lbs 4 1/2 5 1/4
88 lbs 5 5 7/8
99 lbs 5 1/2 6 3/8
110 lbs 6 6 7/8
132 lbs 6 7/8 7 7/8

Transition Instructions

We recommend at least a 7 day transition before you begin feeding the new food exclusively. Start by mixing 75% of the old diet with 25% of the new diet on Day 1 and Day 2. On Day 3 and Day 4, mix 50% of the old diet with 50% of the new diet. On Day 5 and Day 6, mix 25% of the old diet with 75% of the new diet. On the 7th day, you can feed the new food exclusively. This allows your pet’s digestive system to smoothly adapt to the new food.


Frequently Asked Questions

How are Royal Canin diets preserved?

All of our dry diets are preserved naturally with mixed tocopherols, citric acid, and rosemary extract. Our canned diets are naturally preserved and sterilized during the cooking and canning process.

Where do the ingredients in Royal Canin diets come from?

We select our ingredients based on multiple factors, including the supplier’s compliance with our quality and food safety requirements, consistent availability, and on the nutrients required to meet the dietary needs of the pet.Royal Canin is making strides towards sustainability by attempting to obtain sources of raw materials as close to each manufacturing facility as possible. In some cases, we use international suppliers, because only those suppliers can offer raw materials that comply with our quality and food safety standards.

Why do some Royal Canin diets contain by-products?

Royal Canin chooses ingredients because they deliver high-quality nutrients that support our customized pet food formulas. Using chicken by-product meal instead of chicken meal for example will allow Royal Canin to maintain its highly customized nutrient standards while achieving a more secure and sustainable supply.

Why do some Royal Canin diets contain grains?

Grains can be a healthy part of any cat or dog’s diet. As always, we focus on the nutrients each ingredient provides and grains can provide many important nutrients.

How do you ensure Royal Canin diets are safe for my pet?

Our Quality and Food Safety systems are state-of-the-art and we continue to invest heavily in new technology to make sure they remain that way.* We put our suppliers through a rigorous selection process that doesn’t end with our first purchase.* We monitor every load delivered to our plants to verify the safety and quality of the ingredients we use to make pet food.* We perform tests on finished pet foods before they are shipped to our customers.* We manufacture every pet food we sell, in plants that we own; our plants are ISO 9001:2008 certified for Quality Management and ISO 22000 certified for Food Safety.

How do I know which Royal Canin diet is right for my pet?

Based on size, age, lifestyle, and breed, each cat or dog has unique nutritional needs. For healthy pets, use our Product Selector to find the right diet for your cat or dog.If your pet is experiencing health issues, please refer to your veterinarian for more information. Your veterinarian will consider multiple factors when recommending an appropriate diet.

Customer Reviews

718 reviews 718 Reviews 4.8 out of 5 Stars

98% Recommend

98% of reviewersrecommend this product

4.8 / 5

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  • fast and easy !!

    By on

    Chewy you all was on it..and got it done in 2 days!! y'all are awesome. thank you so much. and my Raleigh loves his new food he needs to eat to keep him well. thank you royal canin.iv heard great things that you guys have done over there at chewy. Raleigh and I are looking forward to a long relationship. oh and , guess who loves to get mail from the FedEx Man. LOL thanks again

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  • She likes iT!

    By on

    Our 3.5 yr old Beagle mix got bladder stones from grain free food. We almost lost her! After her surgery, where they removed countless bladder stones, she was put on S/O. I as worried she wouldn’t lik3 it but she loves it! Both the can & dry food are on the menu for our pupster. I’m very grateful she finds it so tasty.

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  • Great prescription food

    By on

    My dog has been eating this food for years and he loves it. He's 13 pounds and has always eaten the regular size rather than the small, and the kibble pieces are not very big. Please note that you do need a vet's prescription to buy this, but if you already have that it's easy to verify through the site. A big thanks to Chewy for stocking this food!

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  • Royal Canin dog food saves us again.

    By on

    Our rescue dog Heidi has had some problems. As a pup she wouldn't eat and when she did she would get sick. We put her on a Royal Canin Limited ingredient dog food and she was fine. Now she has a urinary problem which could lead to kidney stones so we turned to Royal Canin again. Their Unrinary SO food has allowed us to manage the condition and Heidi is happy again. Thank you Royal Canin for your wide variety of specialty foods.

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  • Great service,

    By on

    They said what they would do and did what they said. My dog must eat a R X, dog food which is quite expensive when purchesed from any of the big box pet supply stores. I heard from a friend about Chewy, and gave them a try my order was cheaper and the order was 0n time and right to my door.

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  • Very pleased

    By on

    I was happy to find this vet recommended food at a reasonable price, and ordering it on line was very efficient, free shipping a real plus.. I don't know how the food will work to help my dog eliminate urinary crystals because she's not been on it very long, but the process of ordering and it being delivered was great... thank you

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  • Great service & product

    By on

    My basset had to change her diet ASAP due to bladder stones/surgery. I called Chewy because I had just received her prior prescription right before I found out about the change. The big Chewy box hadn't even been opened yet. They were so kind and understanding about the situation and getting me a refund for a now unneeded product. The new food was delivered so fast I still had leftovers of the old diet. As far as the Royal Canin SO (both wet and dry), my girl seems to like it better than the Hills and gobbles it up. Fresh, crunchy dry food and undented canned food delivered with speed. Doesn't get much better than that.

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  • He likes it.

    By on

    Our boxer seems to really enjoy the food. We will recheck his urine once he has finished the first bag. He has crystals in his urine and the vet reccomended this food. Hopefully this food works and gets rid of the crystals. Arrived the next day after ordering.

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  • No more urinary problems

    By on

    My Shih Tzu had numerous bladder crystals that were jagged and had to be removed. My vet recommended this food to prevent any further issues. We have had no evidence of them returning since being on this diet. I put my other dog on it too as she is the same breed just in case.

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  • Great product

    By on

    Have been using this dog food recommended by my vet for my dog with good success. It was great to be able to have this quickly delivered to our home at half the cost via Chewy! Being seniors it really helps to stretch the budget.

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