Canine Urinary SO + Hydrolyzed Protein Dry Dog Food
Verified Jun 11, 2026
This is a veterinary therapeutic dry diet for adult dogs that combines a hydrolyzed soy protein source with a specialized urinary formula. It is designed for dogs that need support for urinary tract health while also managing food sensitivities, using controlled mineral levels and added omega-3s and prebiotics. The hydrolyzed protein is broken into smaller pieces to help reduce the chance of triggering adverse food reactions in sensitive dogs.
Nutritionally, this is a well-designed prescription formula for adult dogs that need both urinary support and a hydrolyzed protein diet for food sensitivities. Protein, fat, and mineral levels are appropriate for long-term adult maintenance in most dogs under veterinary supervision. It’s a good choice when you and your vet are trying to manage both bladder stone risk and possible food-responsive skin or gastrointestinal issues at the same time.
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At a Glance
KibbleLab Review
Strengths
- Hydrolyzed soy protein can be very useful for dogs with suspected or confirmed food allergies, as the protein is broken down to reduce the risk of reactions.
- Formulated for urinary health with controlled levels of calcium, phosphorus, and magnesium, which helps manage the mineral content contributing to certain urinary crystals and stones.
- Includes prebiotic sources like dried chicory root and fructooligosaccharides to help support a healthy gut microbiome.
- Uses preserved fats with mixed tocopherols and citric acid instead of artificial colors or flavors, and includes fish oil for beneficial omega-3 fatty acids.
Considerations
- Relies on soy as the sole protein source, which is appropriate for many allergic dogs but may not suit dogs that specifically react to soy, even in hydrolyzed form.
- The main carbohydrate is brewers rice, which is very digestible but lower in fiber and phytonutrients than some whole grains; some dogs may benefit from additional fiber from other parts of the diet.
- This is a targeted therapeutic formula, so it’s best used under veterinary guidance, especially if your dog does not actually have urinary stone risk or confirmed food sensitivities.
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
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.
02
Soy Protein
Soy protein is a concentrated plant-based protein commonly used in pet foods to boost protein content, improve texture and binding, and provide a cost-effective alternative to animal proteins. It supplies substantial protein for dogs and can be used in cat diets when formulas are properly balanced, but its amino-acid profile and digestibility are generally lower than animal proteins (often requiring supplementation such as taurine for cats), and some pets may have soy sensitivities or be affected by soy compounds, so diets with soy should be formulated and processed appropriately.
03
Chicken Fat
Chicken fat is used in dog and cat foods as a concentrated energy and flavor source that supplies essential fatty acids (notably linoleic acid) and aids absorption of fat‑soluble vitamins, improving palatability and supporting skin and coat health. Because it is calorie‑dense, diets must account for added fat to prevent weight gain, and quality (proper rendering and antioxidant protection to prevent rancidity) is important; although fats are less commonly allergenic than proteins, pets with poultry sensitivities may still react in some cases.
04
Natural Flavor
Natural flavor is used primarily as a palatability enhancer in pet foods to improve taste and aroma and is not intended to provide significant nutrients, typically coming from concentrated extracts of meat, poultry, plant, or fermentation sources. While it can increase acceptance in picky dogs and cats, manufacturers are not required to disclose specific sources so pets with known sensitivities or allergies may react, and presence of natural flavor should not be taken as a guarantee of overall product quality.
05
Chicory Root
Chicory root is used in pet food primarily as a source of soluble fiber and the prebiotic inulin to support digestive health, improve stool quality, and assist with weight management by promoting feelings of fullness. It can benefit dogs and cats by feeding beneficial gut bacteria and enhancing nutrient absorption, but it should be introduced gradually because high amounts can cause gas, bloating or loose stools and may be unsuitable for pets with sensitive gastrointestinal conditions.
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
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 Canine Urinary SO + Hydrolyzed Protein Dry Dog 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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