Freeze-Dried Dog Food vs Kibble vs Raw: What Each Does to Nutrients

Written by Lucy Fitzgerald, Founder, WYLDR. Reviewed by Katie McCaul, RNutr, The Pet Diet. Updated 29 June 2026.

The short answer: Kibble, raw and freeze-dried each handle nutrients differently. High-heat extrusion makes kibble convenient but reduces some heat-sensitive nutrients; raw avoids heat but needs careful handling; freeze-drying preserves more by removing moisture at low temperature. No format wins outright, and the right choice depends on your dog, budget and routine.

Freeze-dried dog food has gone from a niche curiosity to something you will find in most pet shops, sitting on the shelf next to the kibble and the freezers full of raw. If you are weighing up the options, it helps to understand that this is not really a contest with a single winner. Kibble, raw and freeze-dried are three different ways of making and preserving food, each with its own trade-offs. This guide explains how each format is made, what the process does to the nutrients inside, how to choose between them, and where a daily supplement can fit alongside whatever you pick. The aim is a fair, factual comparison rather than a sales pitch for any one camp.

How each format is made

In short: Kibble is cooked under high heat and pressure (extrusion); raw is uncooked meat, organ and bone, kept chilled or frozen; freeze-dried is frozen and then has its moisture drawn off at low temperature, with no high-heat cooking.

The differences between these formats come down to how they are processed, so that is the right place to start.

Kibble is made by extrusion. The ingredients are mixed into a dough, then cooked under high temperature and pressure and forced through a shaping machine, before being dried and often coated. It is an efficient, well-established process that produces a shelf-stable, easy-to-store food, which is a large part of why kibble is the most common way dogs are fed.

Raw food is, as the name suggests, uncooked. It is typically made from raw meat, organ and bone, sometimes with added vegetables, and is sold fresh or frozen. There is no heat step at all. That keeps the ingredients close to their natural state, but it also means raw food needs cold storage and careful, hygienic handling. UK research has found that dogs fed raw meat diets are more likely to carry bacteria such as Salmonella and antimicrobial-resistant E. coli, which is part of why hygiene matters and why raw is not the right fit for every household, particularly homes with very young, elderly or unwell people.

Freeze-dried food sits in between in an interesting way. The food is first frozen, then placed under a vacuum where the moisture is drawn off at low temperature without ever being cooked at high heat. The result is light, shelf-stable and dry, but it has been made without the high temperatures of extrusion. The process is used both for complete foods and for supplements and toppers, which is worth keeping in mind as we go.

What high-heat extrusion does to nutrients

In short: High heat is efficient and safe, but it reduces three heat-sensitive nutrients: omega-3 fats, prebiotic fibre and antioxidants. Good manufacturers add some back. It is a normal feature of the process, not a fault.

This is the heart of the comparison, and it is important to be fair about it. High heat is not a flaw in kibble, it is simply how extrusion works, and it brings real benefits in safety, convenience and shelf life. But heat does have a predictable effect on certain nutrients, and three are worth knowing about.

The first is omega-3. The long-chain omega-3 fats EPA and DHA are fragile and sensitive to heat, so high-temperature processing reduces them, and they continue to degrade with exposure to air over time. The second is prebiotic fibre, the specific plant fibre that feeds beneficial gut bacteria, which high heat can reduce. The third is the group of natural antioxidant compounds found in fruit and vegetables, which are also diminished by high temperatures.

It is fair to add that good manufacturers know this and often add nutrients back after cooking or use protective coatings. The honest position is simply that high heat reduces these particular nutrients, so a high-heat food can deliver less of them than the raw ingredients would suggest. This is a neutral, factual point about a process, not a criticism of kibble as a way of feeding.

What freeze-drying preserves and why

In short: Because it removes water at low temperature instead of cooking at high heat, freeze-drying is gentler on the heat-sensitive nutrients, so more of them survive. It is more expensive, though, and some products need rehydrating.

Because freeze-drying removes water at low temperature rather than cooking at high heat, it is gentler on exactly the nutrients that high heat is hard on. The fragile omega-3 fats, the prebiotic fibre and the plant antioxidants are better preserved when they are not exposed to extrusion temperatures. That is the core reason freeze-dried food and freeze-dried supplements are valued: the process holds on to more of the heat-sensitive goodness. Researchers have directly compared freeze-dried, raw and extruded dog foods, and the processing differences between these formats are well documented.

Freeze-drying has a couple of other practical upsides. Removing the moisture makes food shelf-stable without needing a freezer, and it allows for short, clean, recognisable ingredient lists. It is not a magic wand, though. The quality of the starting ingredients still matters, the process is more expensive than extrusion, and some freeze-dried products are designed to be rehydrated with water before serving. As with everything here, it is a set of trade-offs rather than a perfect answer.

Pros and cons of each format

In short: No format wins outright. Kibble leads on convenience and cost, raw on minimal processing, and freeze-dried on preserving heat-sensitive nutrients. The table below sums it up.

No single format is best for every dog and every household. Here is a fair summary of where each one stands.

The detail behind the table: kibble's strengths are convenience, affordability, long shelf life and easy portioning, with the trade-off that high heat reduces some heat-sensitive nutrients. Raw's strengths are minimal processing and palatability with no heat damage, with the trade-offs being storage, careful handling, the knowledge needed to balance it, and that it can be muscle-heavy and so light on omega-3 balance and prebiotic fibre unless these are added. Freeze-dried's strengths are the gentle process, shelf stability without a freezer and clean short ingredient lists, with the trade-offs being a higher price and, for some products, the need to rehydrate.

Which format is right for your dog?

In short: It depends on your routine, budget and what your dog does well on. Many owners use a mix, such as a kibble base with a freeze-dried topper. If your dog has a health condition, ask your vet.

The most useful answer is the least dramatic one: it depends, and there is no single correct choice. A few questions help you narrow it down.

What suits your routine? Kibble is hard to beat for sheer convenience and storage, while raw asks for freezer space and careful handling, and freeze-dried sits in between.

What is your budget? Kibble is generally the most affordable, with raw and freeze-dried usually costing more, so value matters as much as the headline format.

What does your dog actually do well on? Some dogs are fussy, some have sensitive digestion, and the format your dog enjoys and tolerates is a big part of the decision.

And if your dog has a health condition or specific dietary needs, your vet is the right person to guide the choice rather than a blog. Plenty of owners land on a mix, such as a kibble base with a freeze-dried topper, rather than treating it as an all-or-nothing decision. That flexibility is a feature, not a compromise.

Where a daily supplement fits

In short: You do not have to change your dog's whole diet to address what high heat removes. A freeze-dried daily supplement sits alongside any food and tops up the heat-sensitive nutrients a cooked or muscle-heavy diet can lack.

Here is the part that often gets missed in the freeze-dried vs kibble debate. You do not have to switch your dog's whole diet to address the nutrients that high heat reduces. Whatever you feed, you can add those specific things back.

That is exactly the role of a freeze-dried daily supplement. Rather than replacing the main meal, it sits alongside it and tops up the heat-sensitive nutrients that a cooked diet tends to lose, or that a raw diet can be light on. It is a way of getting the benefit of the gentle freeze-dried process without having to overhaul a feeding routine that already works for you and your dog.

This is the thinking behind WYLDR's Every Dog Every Day. It is a freeze-dried daily supplement, a complementary feed rather than a complete food and not a treat, with five clean ingredients: a wild boar base, salmon oil as a source of omega-3, chicory root as a source of prebiotic fibre, blueberry as a source of antioxidants, and beetroot as a source of fibre. It is designed to sit alongside whatever your dog already eats, whether that is kibble, wet food or raw. In other words, your dog's food is good, and this adds back a few of the things that processing is most likely to miss. If you want the wider context, our guide to whether dogs need supplements explains where these gaps come from, and our guide to salmon oil for dogs goes deeper on the omega-3 side.

Serving, storing and a note on cost

In short: Some freeze-dried foods are ready to serve, others rehydrate with a little warm water. Store sealed, cool and dry. It costs more per meal than kibble, which is why many people use it as a topper rather than the whole diet.

A few practical points round out the picture. Some freeze-dried products are ready to serve straight from the pack, while others are designed to be rehydrated with a little warm water first, which also makes them more aromatic and tempting for fussy dogs. The pack will tell you which it is, and it is worth following that guidance rather than guessing.

Storage is simpler than raw but still worth getting right. Because the moisture has been removed, freeze-dried food keeps well at room temperature in a sealed pack, away from heat and direct light. Reseal it properly between uses so it stays dry and fresh.

Then there is cost, which is the honest sticking point for many owners. Freeze-dried food generally costs more per meal than kibble, because the process is slower and more involved and the ingredients are often higher grade, and raw can be pricey too once you factor in storage. The sensible way to think about it is value rather than headline price: what your dog actually needs, what they do well on, and what fits your budget over the long term. This is also why a lot of people use freeze-dried as a topper or a daily supplement rather than the entire diet, getting the benefit of the gentle process without the full cost of feeding it at every meal.

Frequently asked questions

What is freeze-dried dog food?
Freeze-dried food is food that has been frozen and then had its moisture removed under vacuum at low temperature, rather than cooked at high heat. The result is dry and shelf-stable but made by a gentle process that preserves more heat-sensitive nutrients.

Is freeze-dried food good for dogs?
Freeze-dried food can be a good option, valued because the low-temperature process holds on to more of the nutrients that high heat reduces. It tends to cost more than kibble, and some products need rehydrating, so the best choice depends on your dog and your circumstances.

Is freeze-dried better than kibble?
Neither is simply better. Kibble is convenient, affordable and usually a complete food, while freeze-dried is gentler on heat-sensitive nutrients but more expensive. They are different tools, and many owners use both.

Does kibble lose nutrients in processing?
The high heat of extrusion reduces certain heat-sensitive nutrients, including omega-3, prebiotic fibre and antioxidants. This is a normal feature of the process. Good manufacturers often add nutrients back, and a daily supplement is another way to top them up.

Is raw better than kibble for nutrients?
Raw avoids the heat that reduces some nutrients, but it can be light on omega-3 balance and prebiotic fibre unless these are added, and it brings handling and storage considerations. Raw versus kibble is a trade-off rather than a clear winner.

Can I feed freeze-dried alongside kibble or raw?
Yes. Freeze-dried toppers and supplements are designed to sit alongside a main diet, which is a simple way to add back heat-sensitive nutrients without changing your dog's core food.

Sources

• "Apparent total tract nutrient digestibility of frozen raw, freeze-dried raw, fresh, and extruded dog foods" (Translational Animal Science): link
• "A literature review on vitamin retention during the extrusion of dry pet food" (ScienceDirect): link
• Groat et al. (2022), Journal of Small Animal Practice, "UK dogs eating raw meat diets have higher risk of Salmonella and antimicrobial-resistant E. coli faecal carriage": link