
Royal Canin
Sterilized 37
Summary
Royal Canin Sterilized 37 is a specialized adult cat diet designed to meet the altered nutritional needs of neutered felines.
The first ingredient, dehydrated poultry protein, provides concentrated animal-based amino acids that support lean muscle maintenance and enhance palatability.
With 37% crude protein and elevated animal-sourced proteins, it helps preserve muscle mass even as energy needs decline after sterilization.
A moderate fat level of 12% works in conjunction with L-carnitine to optimize fat metabolism and support healthy weight control.
The formula’s balanced mineral profile, including substances like ammonium chloride, supports urinary tract health by encouraging optimal pH levels.
A 6.2% crude fiber content and added fructo-oligosaccharides promote digestive wellness and feelings of satiety to help prevent overeating.
The inclusion of fish oil and soybean oil provides essential omega-3 and omega-6 fatty acids for optimal skin and coat condition.
This formula is suitable for both indoor and outdoor sterilized cats, offering a balanced approach to weight management, urinary support, and overall well-being.
Nutrition
Ingredients
- Dehydrated poultry protein
- Corn
- Vegetable protein isolate*
- Vegetable fibers
- Animal fats
- Hydrolysed animal proteins
- Rice
- Wheat
- Beet pulp
- Corn gluten
- and also:
*LIP: protein selected for its very high digestibility
Vitamins and Additives
- Vitamin A 19000 IU
- Vitamin D3 1000 IU
- and also:
Guaranteed Analysis
Notes
Guaranteed Analysis
More products from Royal Canin
Alternative Products
We compare key factors such as overall score, life stage, and category, along with core nutritional values like protein, fat, fiber, and metabolizable energy.
While not identical, these products fall within a defined range to offer nutritionally comparable options.

Sterilized 37
Product changes
- Moisture changed from 5.5% -> %
- 3rd Ingredient changed from Vegetable protein isolate -> Vegetable protein isolate*
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How the score is calculated?
The actual calculation of the score is based on sophisticated and advanced algorithm that takes into account multiple parameters.
To simplify the explanation, the calculation is based on three main criteria:
(1) Amount of protein (more is better)
(2) Amount of carbohydrates (less is better)
(3) Quality and source of ingredients.
Based on that 3 main criteria, 9 score calculation rules are used to compare the different foods.
One major assumption is that the closer an ingredient is to the top of the ingredient list, the greater its relative weight and contribution to the food.
In general, cat food is composed of protein, fats, carbohydrates, fibers, vitamins, and minerals.
Protein is the most important component in a cat's diet, and cats primarily get their protein from animal meat.
Fat is a primary source of energy and essential fatty acids.
Carbohydrates are controversial in a cat's diet, as cats are obligate carnivores and typically consume very few carbohydrates.
Fibers play an important role in digestion and food absorption, and vitamins and minerals are essential for different organism functions.
Dry matter values are used to compare the amount of nutrients in different cat foods. This means that moisture is excluded from the equation to provide a more accurate comparison.
Putting all of these and more into a formula results in a product score.
The maximum score a cat food can receive is 100. Points are added or removed based on the score calculation rules.
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