Raw vs Kibble for Dogs: What the Studies Measured and Missed

Raw dog food is more digestible than kibble in controlled feeding trials, and it carries a bacterial contamination risk that kibble does not, so neither side of this argument gets to claim a clean win. Kibble wins on cost, convenience, and safety; raw wins on protein digestibility, stool quality, and ingredient simplicity. This comparison covers what the research measured, what the major veterinary bodies say, what each format costs, and how to pick without buying into either camp's marketing, the same way you would with anything else you buy for yourself.

What the digestibility studies actually measured

Two studies from the same University of Illinois lab are the most useful because they fed real commercial diets to healthy adult dogs under controlled conditions and measured what was absorbed. In the 2018 Journal of Animal Science study, dogs fed the roasted refrigerated diets absorbed more protein and fat than dogs fed extruded kibble, while dogs on the raw diet had the lowest fecal pH and the lowest fecal dry matter. Stool scores were not different across diets.¹

The 2024 follow up in Translational Animal Science added frozen raw and freeze dried raw to the comparison. Protein digestibility was higher on the two raw formats than on fresh cooked or kibble, dogs on kibble produced the most stool, and stools were looser on kibble and fresh food than on raw.² In plain terms: on raw, more of the protein goes into the dog and less into the yard, and the stool is firmer and smaller.

Both studies also found large differences in gut bacteria between diets. What they did not find, and did not claim, is that one bacterial profile is healthier. The 2018 study actually reported lower bacterial species richness on the raw and grain free diets than on kibble, which is the opposite of what raw marketing usually implies.¹ If you want the long version on the raw side, our freeze dried raw guide goes deeper.

What the studies did not show

No controlled trial I could find shows that raw fed dogs live longer, have fewer allergies, get less cancer, or have cleaner teeth. Those are the claims that sell raw food. They rest on owner surveys and testimonials, which cannot separate the diet from the kind of owner who feeds it. The WSAVA Global Nutrition Committee's raw diet infographic also notes that feeding bones does not reduce the risk of plaque or tooth loss from periodontitis, and that bones can break teeth and cause obstructions.³ Digestibility is a real, measured advantage. Everything past that is a hypothesis.

The safety gap, with numbers

This is the part raw feeders skip and kibble feeders overstate. An FDA study tested 196 raw pet food samples and found 15 positive for Salmonella and 32 for Listeria monocytogenes; the agency described this as a health risk for the pets eating it and the people handling it.⁴ Kibble is not sterile either, but it is cooked during extrusion, which is why the numbers look different.

Freezing and freeze drying do not close the gap. The CDC states that "Freeze-drying, dehydrating, or freezing raw protein from animals only reduces the amount of germs. These processes do not kill all germs."⁵ The AVMA discourages feeding raw or undercooked animal proteins to dogs because of the risk to animal and human health, while acknowledging that validated technologies such as pasteurization can reduce or eliminate pathogens.⁶ High pressure processing is the main one used on raw pet food, and it does far more than freezing, though it is not sterilization.

What this means for you: if anyone in your house is under five, over 65, pregnant, or immune compromised, the CDC wants you to talk to a vet before feeding raw.⁵ For a healthy adult dog in a healthy adult household, the risk is manageable with the same hygiene you use for raw chicken.

Ingredient quality is a separate question from format

A raw food made from unnamed "meat" with no pathogen testing is worse than a kibble with named proteins, a clean recall record, and a feeding trial behind it. Format sets some limits: kibble needs starch to hold its shape, so it will always carry more carbohydrate than a raw diet, and raw needs pathogen control that kibble gets from cooking. But within each format the range is enormous. That is the whole reason The Truva Standard checks each product on what is in it, how it is labeled, and how the brand has behaved rather than by category. Our label reading guide covers what to look for on either kind of bag.

Cost, in real dollars

Those ranges are my estimates from current retail pricing, not a published figure, and they shift with brand and region. Raw feeders often say the gap narrows because dogs eat less on raw. Digestibility does let you feed somewhat less, but a single digit percentage difference does not close a threefold price gap. Budget honestly.

Convenience

Kibble stores at room temperature, scoops in seconds, and travels anywhere. The FDA's handling advice for dry food is simply to keep it below 80 F in its original bag and wash the bowl after each use.⁷ Frozen raw needs freezer space and a thaw plan. Freeze dried raw splits the difference: it lives in the pantry but needs a few minutes of rehydration and raw meat hygiene afterward. If you travel with your dog or have a dog walker feeding lunch, this matters more than any digestibility coefficient.

A middle path most owners land on

You do not have to pick a side, and picking one just to have an answer ready for someone at the dog park is not a real reason to. A kibble that passed the Standard as the base with a freeze dried raw topper gets you most of the palatability benefit and some of the digestibility benefit at a fraction of the cost, and it keeps the raw handling to a small portion. If you are going fully raw, freeze dried is the easier entry, and the freeze dried raw collection only lists products that passed the Standard on ingredients, labeling, and recall record. If you are staying with kibble, the dog food collection is checked the same way. Whatever you choose, our 7 day transition schedule keeps the switch from wrecking the carpet.

The honest scorecard

• Protein digestibility: raw, by a measured margin.²
• Stool volume and firmness: raw.²
• Pathogen safety: kibble, clearly.⁴
• Cost and convenience: kibble, clearly.
• Long term health outcomes: no controlled evidence either way.
• Nutritional completeness: either, if the bag carries a complete and balanced statement and the brand can show its work.

When to call the vet

Call if your dog has diarrhea for more than a day or two, vomits repeatedly, or stops eating after a diet change in either direction. Call before switching to raw if your dog is a puppy, a senior with health problems, or on medication that affects immunity, or if anyone in your home is in a higher risk group. If a family member gets sick with fever or diarrhea after handling raw food, mention the diet to their doctor.

Sources

1. Algya KM, Cross TL, Leuck KN, et al., "Apparent total-tract macronutrient digestibility, serum chemistry, urinalysis, and fecal characteristics, metabolites and microbiota of adult dogs fed extruded, mildly cooked, and raw diets," Journal of Animal Science, 2018. academic.oup.com
2. Geary EL, Oba PM, Templeman JR, Swanson KS, "Apparent total tract nutrient digestibility of frozen raw, freeze-dried raw, fresh, and extruded dog foods and their effects on serum metabolites and fecal characteristics, metabolites, and microbiota of healthy adult dogs," Translational Animal Science, 2024. academic.oup.com
3. WSAVA Global Nutrition Committee, "Raw Meat Based Diets for Pets," 2021. wsava.org
4. FDA, "Raw Pet Food Diets can be Dangerous to You and Your Pet." fda.gov
5. CDC, "About Pet Food Safety." cdc.gov
6. AVMA, "Raw or undercooked animal-source protein diets" (policy). avma.org
7. FDA, "Tips for Safe Handling of Pet Food and Treats." fda.gov