Urinary S/O Dry Dog Food

Overview
Royal Canin Urinary S/O is a veterinary-formulated dry dog food designed for dogs with lower urinary tract disease including struvite and calcium oxalate crystals. The S/O Index indicates a formula that promotes a urinary environment unfavourable to the formation of both struvite and oxalate stones, and this diet is also effective in dissolving existing struvite uroliths.
The formula features reduced levels of magnesium and other minerals that contribute to crystal formation, while encouraging increased urine volume through dietary means to dilute mineral concentrations in the bladder. Maize flour, rice and dehydrated poultry protein provide a highly digestible base with 18% protein and 17% fat.
Fish oil provides omega-3 fatty acids for general health support, and hydrolysed animal proteins enhance palatability. This diet is also suitable for dogs with recurrent bacterial cystitis associated with urinary stones. This is a complete and balanced prescription diet for use under veterinary supervision.
Nutritional Analysis
A nutritional analysis shows how a dog food is made up of its main nutrients, such as protein, fat, fibre and other components. This helps you understand where the food’s nutrition and energy come from, and how the formula is balanced.
Ingredients
Maize Flour, Rice, Animal Fats, Dehydrated Poultry Protein, Maize Gluten, Minerals, Hydrolysed Animal Proteins, Vegetable Fibres, Soya Oil, Fish Oil, Fructo-Oligosaccharides, Mono- And Diglycerides Of Palmitic And Stearic Acids Esterified With Citric Acid, Wheat Flour, Marigold Extract. Nutritional Additives: Vitamin A, Vitamin D3, Iron, Iodine, Copper, Manganese, Zinc, Selenium, Calcium Sulphate. Preservatives, Antioxidants.

Corn Flour, Zea Mays Flour, Zea Mays, E160b
Maize flour is a finely ground powder derived from whole maize (corn) kernels, making it a plant-based ingredient. It serves primarily as a carbohydrate source, providing energy and aiding in kibble structure. In pet food, maize flour is used in its natural, milled form rather than as a raw kernel, ensuring digestibility and consistent nutrient delivery.
Maize flour is included as a cost-effective carbohydrate source that provides energy and helps achieve the desired texture in pet food formulations. It also serves as a bulk-adding agent, allowing manufacturers to optimise production costs while maintaining product consistency.

Oryza Sativa, Paddy, Oryza Sativa Grain, Oryza Spp.
Rice is a cereal grain derived from the seeds of the Oryza sativa plant, making it a plant-based ingredient. It serves primarily as a highly digestible source of carbohydrates, providing energy for pets. In pet food, rice is typically used in its natural, whole or milled form, rather than as a processed extract, to optimise digestibility and nutrient availability.
Rice is included as a cost-effective carbohydrate source that provides energy and helps create a desirable texture in pet food. It is also easily digestible, making it suitable for sensitive digestive systems and appealing for marketing as a familiar, label-friendly ingredient.

Rendered Fat, Tallow, Lard, E471
Animal fat is a lipid ingredient derived from the tissue of animals, commonly sourced from poultry, beef, or lamb. It serves as a concentrated source of energy and enhances palatability in pet foods. Animal fat is used in its rendered form, not as raw tissue, to ensure safety, stability, and optimal absorption of essential fatty acids for pets’ health and wellbeing.
Animal fat is included as a cost-effective energy source and to enhance palatability, making the product more appealing to pets. It also contributes to the texture and mouthfeel of the final product.

Dried Poultry Protein, Poultry Protein Concentrate, Hydrolysed Poultry Protein, Gallus Spp. Protein
Dehydrated poultry protein is a concentrated animal-derived ingredient produced by removing moisture from poultry meat. It serves as a rich source of highly digestible protein, supporting muscle maintenance and overall health in pets. Rather than using whole poultry, this ingredient is utilised in a dehydrated, powdered form to optimise protein content and shelf stability in premium pet foods.
Dehydrated poultry protein is included as a concentrated, cost-effective source of animal protein to support muscle maintenance and overall nutrition. Its use also allows manufacturers to optimise protein levels while controlling moisture content for improved product stability.

Corn Gluten, Zea Mays Gluten, Zea Mays Protein, E160d
Maize gluten is a protein-rich ingredient derived from the wet-milling of maize (corn), a plant source. It is primarily included in pet food to provide a concentrated source of plant protein, supporting muscle maintenance and overall health. Maize gluten is utilised in a processed form, not as whole maize, to optimise digestibility and nutrient availability for pets.
Maize gluten is included as a cost-effective protein source that helps meet nutritional requirements while supporting product texture and binding. It also contributes to the overall protein content, allowing manufacturers to optimise formulation costs.

Dietary Minerals, Inorganic Nutrients, Essential Minerals, Bulk Elements
Minerals are essential inorganic nutrients derived from the earth, not produced by animals or plants. They play a critical role in supporting various physiological functions, such as bone development, nerve transmission, and enzyme activity. In pet food, minerals are not used in their natural raw or metallic state; instead, they are incorporated as specific compounds (such as sulphates or chelates) to optimise safety and bioavailability.
Minerals are included to meet essential nutritional requirements for pets, supporting overall health and proper bodily functions. They are often added in precise amounts to ensure the product complies with regulatory standards and nutrient profiles.

Hydrolysed Animal Derivative, Hydrolysed Animal Extract, Hydrolysed Animal Peptides, Hydrolysed Animal Protein Hydrolysate
Hydrolysed animal protein is a protein ingredient derived from animal sources, such as poultry or fish, that has been broken down into smaller peptides and amino acids through a process called hydrolysis. Its primary purpose is to provide highly digestible protein, supporting muscle maintenance and overall health. Rather than using whole animal tissue, this ingredient is utilised in its hydrolysed form to optimise digestibility and reduce allergenic potential.
Hydrolysed animal protein is included as a highly digestible protein source that can help reduce the risk of allergic reactions in sensitive pets. It also enhances palatability, making the product more appealing to animals.

Dietary Fibre, Plant Fibre, Fibre, E460
Vegetable fibres are plant-derived components sourced from various vegetables and are included in pet food formulations. Their primary purpose is to support digestive health by providing insoluble and soluble fibre, which aids in healthy bowel function and stool quality. Vegetable fibres are used in their natural form, ensuring pets receive the functional benefits of whole plant material.
Vegetable fibres are included as a cost-effective source of dietary fibre to support digestive health and promote stool quality. They also serve as a bulk-adding agent, helping to optimise product texture and satiety.

Glycine Max Oil, E322, Soya Oil, Soya Bean Oil
Soybean oil is a plant-derived oil extracted from the seeds of the soybean (Glycine max). It serves as a concentrated source of energy and provides essential fatty acids, particularly linoleic acid, which supports skin and coat health in pets. Soybean oil is utilised in its refined liquid form, not as whole soybeans, to optimise digestibility and nutrient availability in pet food formulations.
Soybean oil is included as a cost-effective source of fat and essential fatty acids, supporting energy density and skin and coat health in pet food. It also contributes to product texture and palatability while helping to optimise manufacturing costs.

Fish Liver Oil, Oleum Piscis, Oleum Jecoris, Oleum Piscarium
Fish oil is a nutrient-rich oil derived from the tissues of oily fish, making it an animal-based ingredient. It is primarily included in pet food for its high content of omega-3 fatty acids, which support skin, coat, and joint health. Fish oil is utilised in a purified, liquid form rather than as whole fish, ensuring optimal absorption and safety for pets.
Fish oil is included as a source of omega-3 fatty acids to support skin, coat, and joint health, enhancing the nutritional profile of the product. Its presence also serves as a marketing point, appealing to consumers seeking functional health benefits for their pets.

Oligofructose, FOS, Oligofructan, E968
Fructooligosaccharides are short-chain carbohydrates derived from plant sources such as chicory root. They serve primarily as prebiotics, supporting digestive health by promoting the growth of beneficial gut bacteria. Fructooligosaccharides are not used in their whole plant form but are extracted and purified for inclusion in pet food, ensuring optimal efficacy and digestibility for companion animals.
Fructooligosaccharides are included as a prebiotic fibre to support digestive health by promoting beneficial gut bacteria. They also serve as a label-friendly functional ingredient that can enhance the perceived nutritional value of the product.

Citric Acid Esters of Mono- and Diglycerides, E472c, Citremul, Citremul E472c
CITREM, or citric acid esters of mono- and diglycerides of fatty acids, is a plant-derived emulsifier commonly sourced from vegetable oils and citric acid. Its primary function in pet food is to stabilise fat and water mixtures, improving texture and consistency. CITREM is not used in its natural form but is manufactured as a specific compound to ensure safety, efficacy, and optimal absorption.
CITREM is included as an emulsifier to improve the texture and stability of pet food products, ensuring consistent mixing of fats and oils. Its use also supports efficient manufacturing processes and extends product shelf life.

Triticum Aestivum Flour, White Flour, Plain Flour, All-Purpose Flour
Wheat flour is a finely milled powder derived from the grinding of wheat grains, a plant-based ingredient commonly used in pet foods. Its primary purpose is to provide a source of carbohydrates for energy, as well as some protein and dietary fibre. Wheat flour is utilised in its natural form, making it a functional ingredient for binding and texture in pet food formulations.
Wheat flour is included as a cost-effective carbohydrate source that provides bulk and energy to pet food formulations. It also serves as a functional binding agent, helping to improve texture and product consistency.

Calendula Officinalis Extract, Calendula Extract, Calendula Officinalis Flower Extract, E160b
Marigold extract is a plant-derived ingredient sourced from the flowers of the marigold (Tagetes species). It is primarily included in pet food for its natural antioxidant properties, particularly due to its lutein content, which supports eye health and immune function. Marigold extract is utilised in a concentrated form rather than as whole flowers, ensuring consistent potency and bioavailability in pet diets.
Marigold extract is included as a natural source of lutein to support eye health and provide antioxidant benefits, which can be highlighted in marketing to appeal to health-conscious consumers. Its presence also enhances the product’s label appeal by signalling the inclusion of botanicals.

Retinol, Retinyl Palmitate, Retinyl Acetate, E160a
Vitamin A is an essential fat-soluble nutrient derived from animal sources (as retinyl esters) or plant sources (as carotenoids). It supports vision, immune function, and skin health in pets. In pet food, Vitamin A is not used in its raw or natural state but is provided as stabilised compounds (such as retinyl acetate or retinyl palmitate) to ensure safety, stability, and optimal absorption.
Vitamin A is included as an essential nutrient to support vision, immune function, and overall health in pets, ensuring the product meets established nutritional standards. Its addition also allows manufacturers to optimise the nutritional profile and comply with regulatory labelling requirements.

Cholecalciferol, Colecalciferol, Calciol, E671
Vitamin D3, also known as cholecalciferol, is a fat-soluble vitamin of animal origin commonly derived from lanolin or fish oil. It plays a crucial role in regulating calcium and phosphorus metabolism, supporting healthy bone development in pets. Vitamin D3 is not used in its natural form but is instead utilised as a stabilised compound to ensure safety, efficacy, and optimal absorption in pet food formulations.
Vitamin D3 is included to ensure the finished product meets established nutritional requirements for canine health, supporting bone development and calcium regulation. Its addition allows manufacturers to guarantee consistent vitamin content regardless of natural variation in raw materials.

Ferrum, Fe, E1, Elemental Iron
Iron is an essential mineral sourced from both animal and plant origins, crucial for oxygen transport and energy metabolism in pets. Its primary benefit is supporting healthy red blood cell formation and preventing anaemia. Iron is not used in its natural, raw, or metallic state; instead, it is utilised in pet food as safe, bioavailable compounds such as iron sulphate or iron proteinate to optimise absorption.
Iron is included as an essential mineral to support healthy blood function and overall metabolism in pets. Its addition ensures the product meets nutritional requirements and regulatory standards for complete and balanced pet food.

Elemental I, E127, Iodum, CAS 7553-56-2
Iodine is an essential trace mineral sourced primarily from seaweed or mineral deposits. It plays a critical role in supporting healthy thyroid function and hormone production in pets. Iodine is not used in its natural elemental form due to safety and bioavailability concerns; instead, it is typically incorporated as a compound such as potassium iodide or calcium iodate to optimise absorption and efficacy.
Iodine is included as an essential trace mineral to support thyroid function and overall metabolic health in pets. Its addition ensures nutritional adequacy and compliance with regulatory labelling standards for complete and balanced pet foods.

Cu, ECP, CI 77400, C.I. 77400
Copper is an essential trace mineral sourced from the earth and is vital for numerous physiological functions in pets. It primarily supports red blood cell formation, connective tissue development, and immune system health. Copper is not used in its natural metallic state; instead, it is incorporated into pet food as safe, bioavailable compounds such as copper sulphate or copper proteinate to optimise absorption and efficacy.
Copper is included as an essential trace mineral to meet nutritional requirements for dogs, supporting enzyme function and red blood cell formation. Its addition ensures compliance with regulatory standards for complete and balanced pet food labelling.

E34, Manganum, Mn, EINECS 231-105-1
Manganese is an essential trace mineral sourced from the earth and is vital for numerous metabolic processes in pets. It primarily supports bone development, enzyme function, and antioxidant defence. Manganese is not used in its natural metallic state; instead, it is incorporated into pet food as a safe, bioavailable compound such as manganese sulphate or manganese oxide to optimise absorption and efficacy.
Manganese is included as an essential trace mineral to support metabolic and skeletal health in pets, fulfilling nutritional requirements for complete and balanced pet food. Its addition ensures compliance with regulatory standards and appeals to consumers seeking scientifically formulated diets.

Zn, E579, Zincum, CI 77947
Zinc is an essential trace mineral sourced from the earth and is vital for numerous biological functions in pets, including immune support and skin health. In pet food, zinc is not used in its natural metallic state; instead, it is utilised as a compound such as zinc sulphate or zinc chelate to optimise safety and absorption, ensuring pets receive its full nutritional benefit.
Zinc is included as an essential trace mineral to support immune function, skin health, and overall metabolic processes in pets. Its addition ensures nutritional adequacy and compliance with regulatory labelling standards for complete and balanced pet foods.

Selen, E578, Atomic Number 34, Se
Selenium is an essential trace mineral sourced from the earth, typically derived from plant or yeast-based compounds for pet food use. It plays a crucial role in supporting antioxidant defences and thyroid function. Selenium is not used in its natural, raw metallic state; instead, it is utilised as a safe, bioavailable compound such as sodium selenite or selenomethionine to optimise absorption and efficacy.
Selenium is included as an essential trace mineral to meet nutritional requirements and support overall health in pets. Its addition ensures compliance with regulatory standards for complete and balanced pet food formulations.

Gypsum, E516, Anhydrite, Dihydrate Gypsum
Calcium sulphate is a mineral-derived compound commonly included in pet food formulations. Sourced from naturally occurring gypsum, it is not used in its raw mineral state but is instead utilised as a purified, food-grade compound. Its primary purpose is to provide a bioavailable source of calcium, supporting healthy bone development and maintenance in pets, while also serving as a firming agent in some recipes.
Calcium sulphate is included as a cost-effective source of calcium to support nutritional balance and bone health in pet food formulations. It also functions as a firming agent, helping to optimise texture and product stability.

Antimicrobials, E Numbers, Food Additives, Chemical Preservatives
Preservatives are compounds added to pet food to inhibit the growth of spoilage microorganisms and extend shelf life. Originating from both synthetic and natural sources, their primary function is to maintain product safety and freshness. Preservatives are not used in their raw or elemental state; instead, they are incorporated as specific compounds, such as mixed tocopherols or potassium sorbate, to optimise efficacy and safety for pets.
Preservatives are included to extend the product’s shelf life by inhibiting the growth of spoilage organisms and maintaining freshness during storage and distribution. Their use helps ensure product safety and stability, reducing waste and optimising inventory management.

Antioxidant Agents, Free Radical Scavengers, E306, E321
Antioxidants are compounds sourced from both plant and synthetic origins, commonly added to pet food to protect fats and oils from oxidation, thereby preserving freshness and nutritional quality. Their primary function is to neutralise free radicals, supporting cellular health. Antioxidants are not used in their raw or isolated chemical state; instead, specific forms such as mixed tocopherols or ascorbate compounds are utilised for safety and efficacy.
Antioxidants are included to prevent the oxidation of fats and oils, thereby extending the product’s shelf life and maintaining nutritional quality. They also help preserve colour and flavour, supporting product stability and consumer appeal.
Score Card
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- Overall ScoreScore Info
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About the Brand
Royal Canin Veterinary Diet
Royal Canin Veterinary Diet is a clinic-exclusive therapeutic food range for dogs and cats with diagnosed health conditions. Covers urinary, renal, gastrointestinal, allergy, and more.
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