Cat food production is a multi-stage industrial process that transforms raw meats, grains, and nutrient supplements into shelf-stable products. Whether it ends up as a dry kibble or a wet pâté, the food goes through precise cooking, shaping, and safety steps designed to kill harmful bacteria while meeting strict nutritional standards. The process differs significantly depending on the format.
What Goes Into the Recipe
Every cat food formula starts with a recipe designed to meet minimum nutritional thresholds. In the United States, those thresholds come from AAFCO (the Association of American Feed Control Officials), which sets requirements on a dry matter basis. Adult cat food must contain at least 26% protein and 9% fat. Formulas for kittens or nursing cats require a minimum of 30% protein. Taurine, an amino acid cats cannot produce on their own and will go blind without, must be present at a minimum of 0.10% in dry food and 0.20% in canned food.
To hit those targets, manufacturers blend animal proteins (chicken, turkey, fish, beef, or their meals and byproducts), starch sources like corn, rice, or peas, fats, fiber sources, and a premix of vitamins and minerals. The exact proportions are calculated by animal nutritionists before a single ingredient hits the production line.
How Dry Kibble Is Made
Dry cat food is produced through a process called extrusion, which is essentially high-heat, high-pressure cooking forced through a shaped die. The raw ingredients are first ground into a fine, consistent flour, then blended together in large mixers.
This dry mixture moves into a preconditioner, a chamber where steam and water are injected to begin hydrating the blend and partially cooking the starches. From there, the wet dough enters the extruder itself: a long barrel (roughly 1.5 meters) containing a rotating screw that pushes the material forward under intense mechanical pressure. The screw spins at speeds ranging from around 250 to over 500 rpm depending on the desired texture. Inside the barrel, the combination of friction, steam, and compression heats the dough enough to gelatinize starches (corn starch, for instance, begins to gelatinize around 60 to 70°C) and denature proteins. The entire cooking step inside the barrel takes only seconds.
At the end of the barrel, the cooked dough is forced through a die plate with small holes, typically less than a centimeter in diameter. As the material exits into normal atmospheric pressure, the sudden pressure drop causes it to puff and expand, creating the familiar airy, crunchy texture of kibble. A rotating knife at the die face cuts the extruded rope into individual pieces. The kibble then passes through a dryer to reduce moisture content to around 10%, making it shelf-stable and resistant to mold.
Coating and Flavoring
Plain dried kibble is not particularly appealing to cats. After drying, the pieces enter a coating drum where fats and palatants (flavor enhancers) are sprayed on. These palatants were originally called “digests” because they are proteins, often from chicken, beef, pork, or fish, that have been broken down with enzymes into smaller, intensely flavorful compounds. Dry powder palatants are typically added at 0.5% to 2% of the kibble weight, while liquid versions range from 1% to 3%. This coating is what makes a cat interested in the food.
Vitamins Added After Cooking
The high heat of extrusion destroys certain vitamins. Fat-soluble vitamins A, D3, E, and K3 are among the most vulnerable, along with B1 (thiamine) and B6. These are the nutrients most likely to be added back after cooking, either sprayed onto the kibble with the fat coating or included in forms designed to survive processing. Manufacturers routinely over-formulate, adding more than the minimum requirement of heat-sensitive vitamins, to account for losses during production.
How Wet Cat Food Is Made
Wet food follows a fundamentally different path. The process begins with grinding raw meats and other protein sources into a consistent texture, then blending them with water, gelling agents, vitamins, and minerals. The exact grind determines whether the final product is a smooth pâté, chunky cuts in gravy, or shredded pieces in broth.
Once the mixture is prepared, it is filled into cans or pouches and hermetically sealed, meaning the container is completely airtight. Sealing happens before the sterilization step, which is critical: the food is cooked inside its final packaging so that nothing can contaminate it afterward.
The sealed containers go into a retort, which is essentially a large industrial pressure cooker. Inside, the cans are heated to 240 to 250°F (about 115 to 121°C) at pressures of 15 to 20 psi above normal atmospheric pressure. This temperature is high enough to destroy harmful bacteria, including heat-resistant spores that could cause botulism. The retort cycle has a “come-up time” where the chamber reaches target temperature, a hold period at that temperature, and then a cooling phase. Once complete, the food inside the sealed container is commercially sterile and can sit at room temperature for up to two years without spoiling.
Raw and Fresh Cat Food
A growing segment of the market sells raw or minimally processed cat food. These products skip the high-heat steps entirely, which preserves more of the original nutritional profile and texture of the ingredients. The challenge is food safety, since raw meat naturally carries bacteria like Salmonella.
To address this, some manufacturers use high pressure processing (HPP), a technique that subjects sealed packages of food to extreme pressure, ranging from 450 to 750 megapascals, for several minutes. That level of pressure inactivates Salmonella and other pathogens without raising the temperature significantly. The food retains its raw appearance, color, and nutritional characteristics while meeting safety regulations. HPP is particularly common for chicken-based raw pet foods, where Salmonella contamination is a well-known risk.
Safety and Regulatory Oversight
In the U.S., pet food manufacturing facilities fall under the FDA’s Food Safety Modernization Act (FSMA), specifically the Preventive Controls for Animal Food rule. This requires every facility to conduct a formal hazard analysis identifying biological, chemical, and physical risks in their production process. Biological hazards include pathogens like Salmonella and Listeria; chemical hazards might include mycotoxins from contaminated grain; physical hazards cover things like metal fragments from equipment.
Facilities must maintain sanitation controls to minimize environmental contamination and may be required to conduct product testing and environmental monitoring depending on the nature of their operation. The rule is designed to prevent contamination proactively rather than relying solely on end-product testing to catch problems after the fact.
Why the Same Ingredients Taste Different
If you have ever wondered why your cat prefers one brand over another despite similar ingredient lists, the answer is largely in the processing details. The extrusion speed, the coating formula, the specific enzymatic digest used as a palatant, and even the kibble shape all influence whether a cat finds the food acceptable. Manufacturers invest heavily in palatability testing, often using two-bowl preference trials where cats choose between formulations. The fat coating and digest spray are the primary levers companies adjust to differentiate their product’s appeal, since the base kibble itself is relatively bland after extrusion and drying.