Why freeze-dried is the gold standard in pet nutrition
Every method of preserving food involves a trade-off. Heat destroys nutrients. Freezing requires cold-chain logistics. Chemical preservatives raise safety questions. Freeze-drying is the only method that eliminates the trade-off entirely: maximum preservation, zero nutrient destruction, complete safety.
It's not new technology — but in pet food, it's still relatively rare. Here's why it matters, how it works, and why it produces fundamentally better nutrition than any other processing method available.
How freeze-drying works
The process is elegant in its simplicity. Raw ingredients are cooled to sub-zero temperatures. Then, under vacuum conditions, all moisture is removed directly from the frozen state — a process called sublimation. The water goes from solid (ice) to gas (vapour) without ever passing through a liquid phase.
No heat is applied at any stage. No chemical bonds are broken. No preservatives are added. The food is preserved in its natural state — structurally and nutritionally identical to the raw ingredient, minus the water.
Add water back, and the food rehydrates to something virtually indistinguishable from the original raw material. The texture returns. The aroma returns. The nutritional profile was never altered in the first place.
Originally developed for NASA — tested on humans for decades
Freeze-drying wasn't invented for pet food. It was developed for NASA to prepare food for astronauts. In the harsh environment of space, the requirements are uncompromising: a preservation method that is maximally gentle, completely prevents spoilage, produces lightweight food, and delivers nutrition that is as complete and balanced as possible.
This technology was tested on humans over the course of many years and recognised as highly effective and safe. It's now used across the pharmaceutical, food science, and biotech industries wherever nutrient integrity is paramount.
The same technology that feeds astronauts in space now feeds pets on earth. The requirements — maximum nutrition, maximum safety, maximum shelf life — are the same.
97% nutrient retention — and why that number matters
Retaining 97% of nutrients is what distinguishes freeze-drying from every other food processing method. Even standard home cooking yields inferior results, to say nothing of industrial ultra-processing.
What does 97% retention actually mean in practice? It means that the proteins, fats, vitamins, minerals, amino acids, and enzymes present in the raw ingredient are still present — in their original form and at their original levels — in the finished food. Nothing is destroyed. Nothing needs to be rebuilt synthetically.
This is the fundamental difference. With extrusion, manufacturers destroy the majority of natural nutrients through extreme heat, then add synthetic vitamin and mineral packs to meet minimum nutritional standards. The label says "complete and balanced" — but the body is receiving synthetic replacements, not the nutrients it evolved to process.
Read more here.
How freeze-drying compares to other methods
| Method | Heat | Nutrient retention | Key drawback |
|---|---|---|---|
| Extrusion (dry commercial food) | 110–180°C | Low (~20%) | Maillard reaction, vitamin destruction, requires synthetic vitamin packs, produces AGEs and acrylamide |
| Air-drying | Mild heat | Moderate | Fats continue to deteriorate and go rancid over time; shorter effective shelf life |
| Dehydration | 40–70°C | Moderate | Heat damages heat-sensitive vitamins and enzymes; texture and flavour altered |
| Fresh raw | None | High | High hygienic risk (Salmonella, E. coli); requires freezer storage and cold-chain handling |
| Freeze-drying | None | 97% | Higher production cost — no nutritional drawback |
The comparison is clear. Extrusion trades nutrition for manufacturing efficiency. Air-drying is better but still degrades over time. Fresh raw preserves nutrients but introduces safety risks. Freeze-drying is the only method with no nutritional compromise.
Read more about Freeze-Dried vs Raw: Full Comparison, Is Kibble Bad for Dogs? and Is Kibble Bad for Cats?
Bioavailability: why the natural form matters
Preserving nutrients is only half the story. The form those nutrients take determines how well the body can actually use them.
With freeze-drying, the natural form of nutrients is preserved completely intact. In their intact form, they are better absorbed — because the body's pathways for digestion, absorption, transport, and metabolism are specifically adapted to the natural form of food. The entire system — enzymatic machinery, intestinal microflora, liver, biliary tract — functions as intended when it receives nutrients in their original state.
Synthetic vitamin packs added to processed food are not the same. They may contain the same molecule, but the body processes natural and synthetic forms differently. Bioavailability — the proportion of a nutrient that is actually absorbed and used — is consistently higher with naturally preserved nutrients.
This is what makes freeze-drying the best method for maintaining the digestive system in an intact, healthy state. It is nutrition as nature intended — preserved, not reconstructed.
Safety: pathogen elimination without compromise
One of the most common objections to raw feeding is the hygiene risk — Salmonella, E. coli, parasites. It's a legitimate concern. Fresh raw diets require careful handling, cold storage, and rigorous hygiene protocols.
Freeze-dried products eliminate this risk entirely. The final stage of the process ensures hygienic safety. All pathogens — bacteria, viruses, parasites — are eliminated. The result is food that is nutritionally raw but hygienically safe. It can be stored and handled in a normal kitchen, with no risk of contamination to pets or the humans who feed them.
Full nutritional value. Highest hygienic standards. No trade-off.
What this means for RAWR
RAWR uses freeze-drying because there is no better method. Every recipe starts with 85%+ prime-cut meat and functional ingredients — and freeze-drying preserves all of that nutrition exactly as it is. No heat damage. No synthetic rebuilds. No preservatives needed.
Check Our Ingredients.
The result is food that is complete, balanced, shelf-stable, safe, and nutritionally superior to any other format available — for both dogs and cats.