Pet Food Processing: 4 Production Routes Compared (2026 Guide)

Pet food processing is the set of four production routes – dry extrusion, freeze-drying, hot-air drying, and retort canning – that turn raw ingredients into a specific finished-product format, and it is the format, not the species on the label, that sets the equipment a buyer actually needs.

Prepared with Shandong Shengtu Bufan Intelligent Technology Co., Ltd.’s published line specifications – Updated August 2026

Pet food processing isn’t one production method – it’s four distinct routes, and the format of the finished product decides which one applies, not the species or brand behind it. Four machine types define the four routes – a dry kibble line, a vacuum freeze-dryer, a hot-air jerky dryer and a retort canning line – each removing moisture or managing pathogens through a different mechanism, so a buyer sizing equipment against the wrong route’s assumptions will get the wrong numbers before a single quote is requested.

What Pet Food Processing Covers

“Pet food processing” is an umbrella term for four production methods that turn raw food ingredients into finished food products. This category is sized at roughly $6.43 billion in 2026, projected to reach $10.39 billion by 2034 at a 6.17% compound annual growth rate, per Fortune Business Insights – but that number blends four routes that don’t compete with each other so much as serve entirely different product formats. Dry pet food accounts for roughly 63% of that category by value, with wet and canned formats making up about 37% – a split that roughly tracks which of the four routes gets specified most often.

Those four routes are: dry kibble extrusion, which cooks and shapes a recipe through a screw extruder into the familiar kibble pellet; vacuum freeze-drying, a batch process that sublimates ice directly out of a product under low pressure to make shelf-stable raw-style treats; hot-air jerky and semi-moist drying, which reduces water activity in strips or chunks through convective heat rather than freezing; and retort wet canning, which seals product in a container first and then applies heat to achieve microbial lethality through a controlled thermal cycle inside the sealed pack. Each is a different answer to the same underlying question – how does this specific product become shelf-stable – and the answer that fits a dry, crunchy kibble is close to irrelevant for a soft, high-moisture treat.

This is why it isn’t species, it’s format that’s the variable that actually controls the path. An extrusion plant that runs both dog food and cat food kibble on the same line needs only to worry about two recipes, whereas a plant trying to run kibble and freeze-dried treats for one species is managing two completely separate businesses in one building: the equipment, batch economics, and food-safety control points don’t overlap. Treating these four routes as variations on one machine, rather than four separate capital decisions, is the assumption most likely to produce a mis-sized quote.

Dry Kibble Extrusion

Dry kibble extrusion takes a ground, conditioned formula and turns it into the shelf-stable pellets that make up most dry pet food, typically in a single- or twin-screw extruder, which cooks the product through heat and pressure and shapes it through a die before a knife slices it to length. Twin-screw extruders are commonly specified for higher-fat or more complex recipe formulations because they distribute fat and moisture uniformly across the barrel much more effectively than a single-screw extruder, and this affects the density and coating absorption of the final kibble product very directly during later parts of the line.

Shengtu’s own extrusion-line configuration runs an 8-stage sequence, batching/dosing, grinding, mixing and conditioning, twin-screw extrusion, shaping and cutting, multi-layer drying, coating and seasoning, then conveying and packaging. The stage that most often gets underestimated when a buyer is comparing quotes is the dryer, not the extruder. An extruder’s rated throughput describes what the screw can physically push through the die; it says nothing about how fast the resulting pellet can actually be dried to a stable moisture content, and in practice the dryer and coater set the real ceiling on the line’s output far more often than the extruder does.

For a more detailed explanation of where actual kibble lines tend to bottleneck in real operation – including what the typical failure modes look like in a newly commissioned line, see Shengtu’s dry kibble extrusion line troubleshooting guide. Once the route itself makes sense, the stage-by-stage configuration, capacity matching, and acceptance criteria behind that buying process are covered on the dry kibble line’s dedicated equipment page.

Freeze-Dried Pet Treats

Vacuum freeze-drying, also called lyophilization, keeps a treat shelf-stable by freezing it solid and then extracting the ice directly as vapor by reducing the pressure – sublimation – as opposed to evaporating water that was never frozen in the first place, the way hot-air dryers do. This is also why pet-treat freeze-drying runs as a batch process rather than a continuous one: each load has to be frozen, primary dried, and secondary dried in a sealed chamber. Continuous, conveyor-fed vacuum freeze-drying does exist commercially – instant coffee is the best-known example – but it hasn’t caught on in the pet-treat category the way batch chambers have.

One strange fact to get out of the way early: a higher vacuum doesn’t speed a freeze-drying cycle up. General freeze-drying guidance keeps the chamber pressure well below the vapor pressure above the ice surface in the piece, but not at the deepest vacuum achievable – because past a certain point the residual gas that helps conduct heat into the ice thins out, so the deeper the vacuum is taken the more difficult it is to transfer heat in and the slower the cycle may actually run. Equipment vendors make the same point about drying speed versus product quality: blasting the highest possible heat is not always the best option, since speed and product quality trade off against each other.

Shengtu’s freeze-dried pet treat line proposal baseline runs at 150 kg or more per batch, roughly 20 square meters of effective drying area, a shelf temperature range of -45°C to +80°C, a cold trap holding -60°C or colder, and 300 kg or more of rated ice-capture capacity per drying cycle (an independent condenser-capacity minimum, not a fixed ratio to the 150 kg batch-load minimum above), figures that size the chamber and refrigeration plant around the batch, not around a continuous throughput number the way an extrusion line would be specified. At the top of that range, the freeze-dryer module’s own installed electrical load runs up to roughly 88 kW at 380V/50Hz – a figure worth checking against the plant’s actual electrical service before a chamber size gets locked in, since it doesn’t scale in a simple straight line with batch weight.

A sizing mistake you see often is a producer sizing a freeze-dryer they plan to use for pet-meat and -poultry treats using the water content of plant-derived produce as the sizing metric. High-moisture produce commonly runs 80-95% water as harvested. USDA’s own published figures put raw beef and poultry cuts at roughly 56-73% water depending on cut and fat content instead – fattier cuts running toward the low end, leaner cuts like beef eye of round running toward the high end. Sizing a jerky-adjacent or pet-treat freeze-dryer off the produce band systematically overstates the incoming water load the equipment actually has to remove.

For the configuration specifics, material preparation, freeze-drying parameters, metal detection, and packaging handoff, see the freeze-dried pet treat production line page. Shengtu’s dedicated vacuum freeze-dryer platform page covers the equipment itself in more depth, independent of the pet food application.

Pet Jerky and Semi-Moist Treat Drying

Unlike the freeze-drying route just covered, jerky and semi-moist treat production runs cutting, marinating, hot-air drying, metal detection, and packing in sequence, and the drying stage is where the most misunderstood food-safety question in this whole category lives: drying by itself isn’t a lethality step. Inside a dehydrator or a low-temperature oven, evaporating moisture absorbs most of the applied heat, so the meat itself doesn’t actually start rising in temperature until most of that moisture is already gone, which means any pathogens present have more time to become heat-resistant before the product ever reaches a temperature that would kill them.

This is the physical reason USDA recommends pre-heating meat to 160°F and poultry to 165°F to destroy harmful bacteria before drying begins, then holding 130-140°F through the drying cycle itself. Two scope notes matter for a commercial buyer reading that figure: first, this specific guidance is published by USDA’s Food Safety and Inspection Service for home-dehydrated jerky, under USDA’s jurisdiction over meat and poultry; pet treats fall under FDA’s animal food rules instead, so a commercial pet-treat producer’s own validated process is what governs, not this consumer figure directly. Second, USDA’s own page confirms commercially made jerky safety is established through federally inspected plants running their own monitored process, not through duplicating a home dehydrator’s exact numbers. The physics, that drying alone doesn’t kill pathogens and pre-heating buys a safety margin, is the same on both sides of that jurisdictional line, which is why the number gets referenced across the industry even outside its original scope.

On the equipment side, Shengtu’s KHG batch ovens run 250–500 kg per load, and the continuous option is a 1,000mm mesh-belt dryer at roughly 14.25 kW of total installed power (the line supports electric, steam, gas, or heat-pump heat sources, so how that power splits between drive/control load and heating duty depends on which one is specified), running a 50–95°C, 6–15 hour drying window depending on product thickness and target water activity. At the smaller end of the same line, the strip cutter that feeds it draws only about 1.5 kW – a reminder that on a jerky line, installed power scales with the drying stage, not the cutting stage. Chamber-uniformity matters because a set-point reading at the sensor doesn’t guarantee the same temperature at every strip on the belt, and the gap between the two is what actually drives batch-to-batch consistency. That is the practical reason chamber-uniformity data is worth asking for on its own, not folded into a single drying-time spec.

See the pet jerky and semi-moist drying line page for batch and continuous configuration options, or Shengtu’s mesh-belt hot-air dryer platform page for the dryer itself outside the pet food context.

Wet and Canned Pet Food

Wet and canned pet food runs dicing, filling, seaming, retort sterilizing, air drying, and labeling – and unlike the other three routes, wet food production is the one where the equipment itself achieves microbial lethality by design, because the product is sealed inside its final container before the heat is ever applied.

Shengtu’s retort equipment spans four vessel sizes from roughly 80 kg (a 700mm chamber) up to roughly 900 kg (a 1,200mm chamber, 2 m³ flagship), built in 304 stainless, with filling throughput up to 2,800 cans per hour at 3% or better accuracy and seaming rates of 15–50 cans per minute across a can-size range of roughly 50–127mm in diameter by 50–200mm in height.

The distinction that matters most for a buyer evaluating any retort supplier is validation versus verification versus monitoring, and who’s actually responsible for each. Validation is the one-time (or periodically repeated) scientific work that establishes a thermal process actually achieves the required lethality for a specific product and container – this has to come from a qualified processing authority, not the equipment vendor. Verification confirms the validated process is being followed correctly during production. Monitoring is the real-time tracking of the process parameters – temperature, time, pressure – during each individual retort cycle. A retort machine can execute a schedule precisely; it can’t establish on its own that the schedule is correct for a given recipe and container size.

On the equipment side, three Part 113 sections define what a retort supplier and processor each need to have in place: 113.40 covers equipment and procedures – including the temperature-indicating device accuracy Shengtu’s own retort specification references; 113.83 covers establishing the scheduled process itself, which by regulation has to come from a qualified person relying on a competent processing authority’s procedures, not the machine builder; and 113.100 covers the processing and production records that document each batch actually ran the scheduled process. None of the three make the equipment vendor responsible for the food-safety outcome – they define what the processor’s own program has to produce, with equipment that’s built to support it.

See the wet pet food canning line page for the four retort vessel sizes and filling/seaming configuration options.

Choosing the Right Route, The Four-Route Compatibility Grid

Retort wet canning is the only one of the four routes built for thermal lethality by design – exactly the kind of route-defining difference the Four-Route Compatibility Grid is built to surface. The Grid checks a product’s moisture target, texture goal, and batch-versus-continuous fit against all four routes at once, so any mismatch shows up before a single supplier conversation.

Reading the Four-Route Compatibility Grid as a decision path: if the product needs a low-moisture, cooked, crunchy format at continuous high volume, dry kibble extrusion is the starting point. If it needs a raw-style texture and premium positioning and the plant can absorb batch economics, freeze-drying is the route, but plan the food-safety validation separately, since the process itself doesn’t provide lethality. If it’s a semi-moist or jerky-style treat, hot-air drying fits, provided the pre-heat step and chamber uniformity are engineered in, not assumed. If the product needs to be shelf-stable without refrigeration and without relying on low water activity at all, retort wet canning is the only one of the four routes built for that outcome by design. For a guided, interactive version of this same fit check, see Shengtu’s format-to-production-route selector.

Food Safety and Regulatory Compliance: Animal Food, Not Human Food, Rules

Pet food is legally animal food in the US, and it is governed by its own branch of FSMA – the Preventive Controls for Animal Food rule at 21 CFR Part 507. That is a separate regulatory track from Part 117, the rule most generic “food processing” content assumes applies. A processor building a food-safety plan around Part 117’s human-food requirements is working from the wrong rulebook.

Formally titled the Current Good Manufacturing Practice, Hazard Analysis, and Risk-Based Preventive Controls for Food for Animals rule, Part 507 created two requirements in one: current good manufacturing practice (CGMP) foundation sanitation and manufacturing procedures, and the hazard analysis preventive controls (PC) rules below. Firms who treat their CGMPs as a checklist separate from the hazard analysis already have a myopic understanding of Part 507’s expectations.

Part 507’s core obligations are concrete, not aspirational. 21 CFR 507.33 requires a written hazard analysis for every type of animal food manufactured at a facility, covering biological, chemical, and physical hazards; the hazard analysis has to be written regardless of what it concludes. 21 CFR 507.34 then requires written preventive controls with stated maximum or minimum parameter values wherever a process control applies, plus sanitation controls, supply-chain controls, and a recall plan. These are facility-level, process-level obligations; they describe what the processor’s food-safety program has to contain, not what a piece of equipment does on its own.

One correction worth making explicitly: AAFCO doesn’t certify or endorse pet food. According to AAFCO’s own published position:

“AAFCO does not regulate, test, approve or certify pet food.”

Instead, AAFCO produces model regulations and nutrient profiles – the technical basis manufacturers use to formulate balanced diets and support consistent pet nutrition outcomes – for government adoption into law and develops feed ingredient definitions, but GRAS (Generally Recognized as Safe) status itself is established either through FDA’s voluntary notification process or independently through a company’s own self-affirmed determination backed by qualified experts – neither pathway runs through AAFCO, and AAFCO doesn’t test, approve, or certify individual products. The distinction between standard-setting and product-level certification is a common point of confusion in pet food marketing more broadly.

Evaluating Equipment Cost and Total Cost of Ownership

Food-safety compliance is the facility’s responsibility, not the equipment’s, but the equipment purchase itself still has to be evaluated on more than sticker price. Comparing two pet-food processing equipment quotes on the price alone gives you almost nothing for a real-world comparison considering installation, energy, maintenance, spares, and downtime risk over a realistic ownership horizon. Any actual differences separating one bid from another are almost always absent from page one of either document.

For true like-for-like purchasing, a comparison needs five line items priced over the same horizon for every option: purchase price, installation and commissioning, energy cost over the ownership period, maintenance and spares over the same period, and the cost of downtime risk, which depends on how often a component fails and how long it takes to get a replacement part or technician on site.

Payback figures quoted in this specific part of the industry don’t tend to hold water across different recipes and lines – capital intensity, utility rates, and labor cost vary too much by site for a single number to be honest. What does hold: the relative weight of each cost line shifts by route and site, which is exactly why the five-item table above – rather than a single payback number – protects a buying decision. Shengtu’s six-variable quotation scoring tool walks through the same comparison against a specific quote.

Choosing a Processing Equipment Manufacturer

Total cost of ownership only tells half the story — who you buy from matters as much as what the five-item comparison adds up to. Buying and evaluating pet food machinery now involves considering not just the market’s large-scale equipment segment that pet food manufacturers researching this category will run into (Buhler and GEA lead this equipment category by share, alongside specialized regional builders — Buhler Holdings at roughly 19%, GEA Group AG at about 16%, per the same Fortune Business Insights report), but also smaller, more focused equipment producers scattered in regional locales. Scale isn’t the deciding factor by itself; what actually separates a good quote from a risky one is whether the supplier answers the following points before a contract is signed.

A pattern that shows up across supplier pages in this space: most publish either real technical specifications or real commercial terms, lead time, MOQ, payment terms, but rarely both together. A supplier willing to put lead time and payment terms in writing alongside their technical specs, before a deposit changes hands, is answering the question most peers leave for a phone call.

Where Pet Food Processing Is Headed

Choosing the right manufacturer today should also account for where the category is going. What jumps out for now, out of the 2025-2026 data, is a clearer movement away from single-route output and toward flexible multi-product design, driven by pet owners wanting freshly made, freeze-dried, or wet formats alongside standard extruded kibble. That shift comes down to plant design, not just extruder size.

Behind that change: the market is still forecast to expand from roughly $6.43 billion in 2026 to $10.39 billion by 2034 at a 6.17% CAGR; automation and traceability adoption is proceeding rapidly across food manufacturing generally, while non-thermal processing technologies are emerging for raw and fresh formats specifically. One notable example is high-pressure processing (HPP): independent peer-reviewed studies record pathogen inactivation from approximately 250-750 MPa depending on the desired organism, with approximately 586 MPa for three to four minutes producing 5-log reductions of Salmonella and Shiga-toxin-producing Escherichia coli in pet food formulations. HPP adoption in pet food remains very new compared to thermal- and dry-based routes, but it’s a real option for raw and fresh formats specifically, worth knowing about even for a buyer whose current product doesn’t need it yet. One area to keep an eye on: plasma treatment and other non-thermal methods are attracting active research interest, even though adoption in commercial pet food production is still limited – a reminder that research activity and commercial rollout don’t necessarily move on the same timeline.

Frequently Asked Questions

With the Four-Route Compatibility Grid, the trends shaping the category, and the buying questions above in hand, ready to move from route selection to a specific line configuration? Review all four pet food processing lines →