Feline Urinary SO Moderate Calorie Dry Cat Food
Verified May 23, 2026
This is a prescription dry diet for adult cats formulated to support urinary tract health while helping manage calorie intake. It uses chicken by-product meal as the main protein source, with rice and corn as primary carbohydrates, and is mineral- and urine-pH–controlled to help reduce the risk of certain urinary crystals and stones. The moderate fat level and added L-carnitine make it suitable for cats prone to weight gain who need ongoing urinary support.
Nutritionally, this is a well-designed therapeutic diet for adult cats with urinary issues who also need their calories moderated. The protein level is appropriate for most adult cats, and the recipe uses controlled levels of minerals like magnesium, calcium, and phosphorus along with urine-acidifying ingredients to support a healthier urinary environment. It’s best used under veterinary guidance, particularly for cats with a history of urinary crystals, stones, or blockages.
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At a Glance
KibbleLab Review
Strengths
- Formulated specifically to support urinary health, with controlled magnesium, calcium, and phosphorus and acidifying ingredients to help reduce crystal and stone formation risk.
- Moderate calorie density (about 299 kcal per cup) with added L-carnitine to support weight management in cats prone to weight gain.
- Provides complete and balanced nutrition for adult maintenance, so it can be used as the sole diet for appropriate cats under veterinary supervision.
- Includes fish oil and chicken fat as sources of essential fatty acids, plus added taurine and a full complement of vitamins and trace minerals for overall health.
Considerations
- This is a prescription veterinary diet and should only be fed under the direction of your veterinarian, especially if your cat’s urinary signs change or resolve.
- Chicken, egg, corn, wheat gluten, and fish oil are present, so this diet would not be suitable for cats with confirmed allergies or adverse reactions to any of those ingredients.
- The protein content, while adequate for most adult cats, is somewhat moderate compared to some non-therapeutic high-protein diets and may not be ideal for cats with very high energy needs unless portions are adjusted.
Full Ingredient List
Ingredients and analysis reflect manufacturer data at the time of our last update and can change without notice. Always check the actual product packaging before feeding.
Ingredient filtering helps identify compatible options but is not a substitute for a veterinary elimination diet.
Top 5 Ingredients Explained
01
Chicken By-Product
Chicken by-product is a common protein ingredient in pet foods made from edible parts of the bird not typically consumed by people—such as organs (liver, heart), necks and other tissues—and is used to add protein, flavor and nutrient density. It can provide concentrated protein, essential amino acids, B vitamins and minerals (and may contribute taurine when organ meats are included), but composition and quality vary by source, so pet parents concerned about sourcing, higher ash/fat content or chicken allergies should check the manufacturer’s labeling and quality standards.
02
Brewer's Rice
Brewer’s rice is a milling byproduct of rice processing made up of small broken white rice kernels commonly used in pet foods as a highly digestible carbohydrate source, filler and binder that provides readily available energy for dogs and cats while contributing little protein, fat or fiber. It is generally gentle on the stomach and cost‑effective, but diets using it must supply other ingredients for essential nutrients; pet owners should note its relatively high glycemic load (relevant for weight or diabetic pets), the potential for trace environmental contaminants associated with rice, and not confuse it with brewer’s yeast.
03
Corn
Corn is commonly used in dog and cat foods as a digestible source of carbohydrates and calories, and it also provides some plant protein, fiber, B vitamins and minerals while helping with kibble structure and palatability. While generally safe and economical, corn is relatively high in starch and has an incomplete amino acid profile for obligate carnivores (cats), can be a source of mycotoxin contamination if poorly stored, and although true corn allergies are uncommon, some pets may be sensitive, so quality and proper formulation with animal proteins are important.
04
Pea Fiber
Pea fiber is an insoluble plant fiber derived from peas commonly used in pet foods as a source of dietary fiber and as a texturizer/binder to help form kibble, increase stool bulk, and reduce calorie density; it provides little protein, fat, vitamins, or minerals but can aid satiety and regularity in dogs and cats. While pea fiber can support digestive health and weight management, it may cause gas or looser stools in some pets and — because pea-derived ingredients have been discussed in the context of concerns about grain‑free diets and canine dilated cardiomyopathy — it should be used as part of a balanced, veterinarian‑approved formulation rather than in excessive amounts.
05
Wheat Gluten
Wheat gluten is a concentrated plant protein commonly used in dry pet foods as a protein booster, binder and texture improver to help form kibble and extend meat-based ingredients. It provides digestible protein for dogs and cats but is low in certain essential amino acids (notably lysine) and lacks animal-specific nutrients like taurine, so it should not be the sole protein source; pets with wheat or gluten sensitivities may also experience allergic or gastrointestinal reactions.
Nutritional Breakdown
How to read As Fed versus Dry Matter
As fed shows the numbers straight off the label, water included. Dry matter removes the water so you can compare a wet food and a dry food fairly.What is calorie density
How many calories the food packs per unit. Denser foods mean smaller portions for the same calories.Product Details & Brand
Product Specs
AAFCO Nutritional Adequacy
What is AAFCO
Association of American Feed Control Officials. It sets the nutritional
adequacy standards US pet foods are measured against.
What is AAFCO
Association of American Feed Control Officials. It sets the nutritional adequacy standards US pet foods are measured against.Brand
Royal Canin is a premium pet food brand offering highly specific diets tailored to different breeds, life stages, sizes, and health conditions of dogs and cats. The brand is known for its science-driven approach and collaboration with veterinarians and pet professionals.
Visit Royal CaninWSAVA publishes criteria for evaluating a manufacturer (qualified nutritionists, feeding trials, published research); it does not certify or endorse brands.
Manufacturer
Royal Canin operates manufacturing facilities globally with strict quality control processes and adheres to ISO certification standards. The company maintains full traceability of ingredients, follows HACCP principles, and complies with local and international pet food safety regulations including EU and FDA requirements.
Manufacturing details are compiled from public sources and not independently verified; they may not reflect contract manufacturing or co-packing.
Recall History
Royal Canin Feline Urinary SO Moderate Calorie Dry Cat Food has no recalls since 2014.
Source: FDA Pet Food Recall Database · Monitored daily
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Frequently Asked Questions
Has Royal Canin ever been recalled?
We have no recalls on record for Royal Canin. We monitor the FDA Pet Food Recall Database daily.
How does KibbleLab rate foods?
Our scores are based on ingredient composition, nutritional profile, AAFCO compliance, and health considerations. We don't penalize by-products, grains, or synthetic preservatives. Brands cannot pay for higher scores.
Is KibbleLab a substitute for veterinary advice?
No. KibbleLab provides data-driven food analysis, not medical advice. Always consult your veterinarian before making dietary changes, especially for pets with health conditions.
KibbleLab provides informational content only. This is not veterinary advice. Always consult a qualified veterinarian before changing your pet's diet.
KibbleLab may earn affiliate commissions through product links. No one can pay for a higher score, or to change what we recommend for your pet.
Product data sourced from manufacturer websites, AAFCO statements, and FDA recall database. Last verified dates reflect our most recent data check.
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