Freeze-Dried vs. Raw Diets: Which Is Better for Your Pet?

DigestiveComparisonsMeongsiljang Veterinary Advisory Board

We’ve compared freeze-dried and raw (BARF) diets in terms of nutrition, safety, and convenience, and outlined veterinary-backed criteria to help you choose the best option for your pet’s individual constitution and living environment.

What Are the Differences Between Freeze-Dried and Raw Diets?

A scene comparing freeze-dried food and raw food side by side

Freeze-dried and raw (BARF) diets are both based on raw ingredients, but they differ in processing methods and microbial safety. The most important factor is choosing the option that best suits your pet’s immune status and your household environment. Raw diets carry well-documented risks of contamination by pathogens such as Salmonella and E. coli, as well as parasites, so extra caution is advised for homes with immunocompromised animals or family members who are young children, elderly, or undergoing cancer treatment. Freeze-drying removes moisture to create an environment where bacteria struggle to multiply, but because it does not use heat sterilization, pathogens present in the raw ingredients may remain. Therefore, rather than assuming freeze-dried food is completely safe, it is wise to verify that it is labeled as a complete diet and to maintain strict hygiene practices. Conversely, for healthy adult dogs where palatability and a whole-food texture are top priorities, a raw diet can be carefully considered, provided that rigorous hygiene standards are maintained.

They Start with Different Processing Methods

Freeze-drying involves rapidly freezing raw ingredients to below -40°C and then sublimating the ice directly into water vapor in a vacuum, removing only the moisture. Since minimal heat is applied, nutrient loss is minimal, and the low water activity (aw) inhibits bacterial growth. In contrast, raw diets consist of ingredients served either completely unprocessed or minimally processed at low temperatures and kept frozen or refrigerated, resulting in high moisture content of 60–70% or more, with microorganisms potentially remaining in an active state.

Freeze-Dried vs. Raw Diets at a Glance

Item	Freeze-dried	Raw (BARF)
Moisture content	2–5%	60–70%
Room-temperature storage	Possible (6–12 months before opening)	Not possible (freezing required)
Salmonella / E. coli risk	Can be reduced but not sterilized (may remain)	Relatively high
Parasite risk	Low (freezing + sublimation)	Present
Palatability (whole-food feel)	High	Very high
Portability / travel convenience	Excellent	Difficult
Price range	Mid to high	Mid to high
Achieving nutritional balance	Many complete-diet products	Difficult when formulating yourself

There is variation between products. Freeze-dried is not a sterilized diet either, so when buying, be sure to check for AAFCO (Association of American Feed Control Officials) complete-diet labeling and the hygiene and handling instructions.

What Are the Differences in Safety Checkpoints?

The biggest concern with raw diets is microbial contamination. A 2020 study by Morelli’s team investigating commercially available raw pet foods found significant microbial contamination, including Salmonella and E. coli, in many products. According to veterinary textbooks, raw diets pose an infection risk not only to pets but also to the people preparing the food, particularly children, the elderly, and family members undergoing cancer treatment. There is also a risk of pathogens spreading to the environment. While freeze-drying removes moisture to inhibit bacterial growth, it is not a sterilization method using heat or high pressure, so pathogens present in the raw ingredients may survive. Therefore, freeze-dried foods cannot be considered “completely sterile.” To ensure greater safety, check whether additional processing such as High-Pressure Processing (HPP) has been applied and verify the manufacturer’s hygiene management standards.

The owner's hand, wearing a sanitary glove, handling the genital area

Avoid Raw Diets in These Cases

If any of the following apply, prioritize freeze-dried (or cooked/processed) food over raw diets: - Compromised immunity: Pets undergoing cancer treatment, on long-term steroid therapy, or with autoimmune diseases - Young puppies and kittens: Under 4 months old, with immature digestive and immune systems - Pregnancy or lactation: The risk of infection rises sharply for both the mother and her offspring - High-risk household members: Infants, pregnant women, family members undergoing cancer treatment, or individuals aged 65 and older - History of gastrointestinal disease: Pets with recurrent diarrhea or inflammatory bowel disease (IBD) should consult a veterinarian first

Which Is Easier for Nutritional Balance?

A study by Dodd and colleagues (2019) reported cases of abnormal bone density in young puppies fed home-cooked raw diets that were not properly balanced. With home-prepared raw diets, caregivers must carefully adjust the calcium-to-phosphorus ratio, vitamins, and minerals, which carries a risk of both nutrient deficiencies and excesses. In contrast, many commercially available freeze-dried complete diets are formulated to meet Association of American Feed Control Officials (AAFCO) standards, making nutritional balance much easier to achieve. However, be sure to check for labels such as "topper" or "complementary food," as these indicate the product is not a complete diet.

An image showing ingredients arranged side by side to support reproductive and nutritional balance.

Convenience, Cost, and Storage Differ Like This

Freeze-dried food can be stored at room temperature and rehydrates with just water, making it convenient for travel and outings. Since a single bag lasts a long time, it’s also cost-effective for medium to large dogs. Raw food, on the other hand, takes up considerable freezer space, and any leftovers after thawing and serving should be discarded within two hours. Proper tool sterilization and hand hygiene are essential, and to prevent parasites, we recommend freezing the food at -20°C for at least two weeks.

Key Nutrients to Check for Both Diets

Safe

타우린(Taurine)

심장 건강 유지, 특히 고양이 필수 아미노산

Dosage: 체중·제품별 상이

고양이는 결핍 시 확장성 심근증 위험

Caution

칼슘:인 비율

골격 발달과 유지

Dosage: 1.2:1~1.4:1 권장

자가조제 생식 시 가장 흔한 불균형 영양소

Caution

비타민 D

칼슘 흡수 및 면역 조절

Dosage: 제품 표기 참고

과잉 시 독성 가능성 있음

Safe

오메가-3(EPA/DHA)

피부·관절·뇌 건강

Dosage: 어유 기준 체중 kg당 40~60mg

동결건조에는 별도 보충이 필요할 수 있음

Be Sure to Follow These Guidelines When Transitioning

When transitioning from your current food to freeze-dried or raw diets, gradually mix the new food in over 7–10 days. Sudden changes can lead to diarrhea, vomiting, or decreased appetite. Monitor your pet’s stool daily during the transition for any abnormalities such as soft stools, mucus, or blood. If these issues persist for more than two days, pause the transition and consult your veterinarian. For pets with a history of pancreatitis, it is safer to avoid raw diets that are high in fat.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Do freeze-dried treats need to be rehydrated in water before feeding?

While not mandatory, it’s highly recommended. Soaking the food in water for 10–15 minutes before serving helps with hydration and aids digestion, especially for cats that don’t drink enough water or senior dogs.

Is it safe to give bones along with raw food?

Raw bones pose risks such as tooth fractures, esophageal obstruction, and intestinal perforation. If you choose to feed them, always provide raw (uncooked) bones that are larger than your dog’s mouth, and only under direct supervision. Cooked bones are strictly prohibited because they splinter and become even more dangerous.

Are freeze-dried or raw diets suitable for cats?

Cats are obligate carnivores with high protein and taurine requirements, so both diets are theoretically suitable. However, raw diets carry a risk of parasites such as Toxoplasma, so caution is advised even for indoor cats. A freeze-dried complete diet is a safer starting point.

Can I mix freeze-dried and raw food when feeding my pet?

It’s possible, but you need to calculate the total calories and nutritional balance together. Freeze-dried foods have very little moisture, so their nutritional (caloric) density is much higher than that of raw food, even at the same weight. If you base the portion size on just one type, it could lead to overfeeding or underfeeding, so be sure to check the feeding guidelines for each product separately.

When is it absolutely necessary to consult with a veterinarian?

If your pet has a history of chronic conditions (kidney disease, pancreatic disease, IBD), is under four months old, is pregnant or nursing, has a history of allergies, or is currently taking medication, please consult your veterinarian before changing their diet. Adjustments may be necessary based on weight and blood test results.

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References

[1] Freeman LM, Chandler ML, Hamper BA et al., Current knowledge about the risks and benefits of raw meat-based diets for dogs and cats, JAVMA, 2013

[2] Morelli G, Bastianello S, Catellani P et al., Raw meat-based diets for dogs: survey of owners' motivations, attitudes and practices, BMC Veterinary Research 15:74, 2019

[3] Dodd S, Barry M, Grant C et al., Abnormal bone mineralization in a puppy fed an imbalanced raw meat homemade diet, Journal of Animal Physiology and Animal Nutrition, 2019

[4] Morelli G, Catellani P, Miotti Scapin R et al., Evaluation of microbial contamination and effects of storage in raw meat-based dog foods purchased online, Journal of Animal Physiology and Animal Nutrition 104:690-697, 2020

[5] The Dog Care Handbook, Things I Wish My Vet Had Told Me, 2024