Raw Food vs Kibble: What the Canine Nutrition Research Actually Shows

The raw-versus-kibble debate is one of the most emotional in dog ownership, and that is exactly why it is so hard to find an honest answer. Raw feeders see a glossier coat, cleaner teeth, and a dog who actually wants to eat dinner, and they conclude the science must be on their side. Kibble defenders see decades of feeding trials and shelves of nutritionally complete food, and they conclude the science must be on theirs. Both camps are partly right, and both are leaving important parts out — so let me walk you through what the peer-reviewed literature actually says, fairly, and tell you where the evidence really lands.

Why this debate is so heated#

If you have ever spent ten minutes in a dog Facebook group, you already know that "what do you feed?" is not really a nutrition question. It is an identity question. Raw feeders feel the pet-food industry has been complacent and profit-driven for forty years and that the rise of allergies, obesity, and chronic disease in pet dogs lines up with the rise of extruded kibble.¹ Kibble defenders feel the raw movement is built on a romanticized "ancestral" narrative that ignores the very real bacterial risks documented by the FDA and the CDC.²

I have spent enough time reading the actual literature to say this clearly: both sides have a point, and neither side has the slam-dunk evidence they think they have. Let me walk through the camps, then walk through what the studies actually show.

The three camps, read fairly#

The raw camp. The argument is that domestic dogs are descended from wolves, share roughly 99.9% of their genome with wolves,³ and evolved on a diet of whole prey — muscle meat, organs, bone, and small amounts of plant matter from gut contents. Cooking, the argument goes, denatures enzymes, destroys heat-sensitive nutrients, and produces compounds (Maillard reaction products, advanced glycation end-products) that the canine digestive tract did not evolve to handle. Raw feeders point to short-term studies showing higher protein and fat digestibility on raw diets, lower fecal volume, firmer stools, less plaque buildup, and shinier coats.⁴ Many raw feeders also distrust the major pet-food companies after the 2007 melamine recall, in which contaminated wheat gluten and rice protein from China killed an estimated several thousand pets and triggered the largest pet-food recall in U.S. history.⁵

The kibble camp. The argument is that modern extruded dog food is the most rigorously studied feeding system in the history of domesticated animals. AAFCO (the Association of American Feed Control Officials) publishes nutrient profiles for dogs at every life stage, and any food labeled "complete and balanced" must either meet those profiles by formulation or pass an AAFCO feeding trial.⁶ The kibble camp points to the documented bacterial contamination of commercial raw diets, the documented shedding of Salmonella and antimicrobial-resistant bacteria by raw-fed dogs, and the absence of any peer-reviewed long-term outcome study showing raw dogs live longer or healthier.⁷

The home-cooked camp. Sits in the middle. Owners cook fresh, identifiable ingredients at home — usually a protein, a starch, a vegetable, and a vitamin/mineral premix — to avoid both the bacterial risk of raw and the processing of kibble. The single biggest risk in home cooking is nutritional imbalance, and that risk is enormous if the recipe was not formulated by a credentialed nutritionist.⁸

What the bacterial-shedding research actually shows#

This is where the evidence is most lopsided, so let me be direct.

The FDA conducted a two-year sampling study of commercially available raw pet food (2010–2012) and found that of 196 raw pet food samples tested, roughly 15 contained Salmonella and 32 contained Listeria monocytogenes. Of comparable cooked treats, jerky-style products, and dry/semi-moist diets sampled, the contamination rates were essentially zero.⁹ That is not a small effect size. That is one to two orders of magnitude.

Beyond the food itself, multiple peer-reviewed studies have measured what happens after the dog eats it. Dogs fed commercial raw diets shed Salmonella and antimicrobial-resistant E. coli in their feces at substantially higher rates than dogs fed conventional kibble, even when the raw-fed dogs are not clinically ill.¹⁰ A 2019 study published in Eurosurveillance found extended-spectrum beta-lactamase-producing (ESBL) E. coli in a meaningful fraction of commercial raw pet food samples sold in Europe.¹¹ These are not bacteria you want circulating in a household with an infant, a chemotherapy patient, or a grandparent.

The raw camp's reasonable rebuttal is that handling raw chicken in your own kitchen carries similar risks, and we do not panic about that. That is partly true — but with two important differences. First, you are not eating raw chicken yourself; you are cooking it. The dog is eating it raw, which means the dog's gut becomes a reservoir. Second, you do not lick your toddler's face after handling raw chicken; the dog does.

What the AAFCO and feeding-trial picture really looks like#

A bag of dog food labeled "complete and balanced for adult maintenance" in the United States has met one of two tests. Either the formulation, on paper, meets the AAFCO nutrient profile for that life stage, or the company has run a six-month AAFCO feeding trial in which a group of dogs ate the food and stayed clinically healthy by certain measured parameters.⁶

The kibble defenders are correct that this is a real, decades-old framework with real teeth. The raw defenders are correct that the framework has limitations: AAFCO feeding trials use small numbers of dogs (typically eight), last six months (not a lifetime), and measure a limited set of clinical and bloodwork endpoints. A diet can pass an AAFCO trial and still be suboptimal in ways the trial would not catch.

The honest reading is that AAFCO is a floor, not a ceiling. It is the minimum we can be confident a diet does not actively harm a healthy adult dog over six months. It is not a guarantee of optimal lifelong nutrition, and the pet-food industry has, at times, leaned on AAFCO as if it were both.

The raw camp also flags, correctly, that the BEG-DCM episode of 2018–2022 (FDA-investigated dilated cardiomyopathy in dogs eating boutique, exotic-protein, grain-free diets) showed that AAFCO-compliant on paper does not always equal safe in the bowl.¹³ That investigation has since become more nuanced — the cause is still not fully resolved — but it is a fair reminder that the regulatory floor is just a floor.

The digestibility, coat, and dental claims#

Short-term studies do support some of the claims raw feeders make.

Digestibility. Multiple peer-reviewed studies have shown that fresh and raw meat-based diets produce higher apparent total tract digestibility of protein and fat than typical extruded kibble, with smaller fecal volumes and firmer stool consistency.¹⁴ This is real. It is also largely a function of higher meat content, lower fiber, and lower carbohydrate inclusion — not rawness itself. A gently cooked, high-meat, low-carbohydrate diet (think the fresh-cooked subscription category) produces similar digestibility numbers without the pathogen load.¹⁵

Coat. Coat improvement on raw diets is plausibly explained by higher fat content, more bioavailable omega-3s if the diet includes whole fish or fish oil, and lower carbohydrate intake. Again, the relevant variable is the nutrient profile of the diet, not whether it was cooked. Many kibbles are deliberately formulated with lower fat and higher carb to hit a target price; that is a reasonable thing to criticize, and it is a different criticism than "kibble is bad."

Dental. This one is more interesting. There is reasonable evidence that chewing raw meaty bones reduces dental calculus and gingivitis in dogs.¹⁶ There is also reasonable evidence that whole carrots, dental chews with the VOHC (Veterinary Oral Health Council) seal, and regular tooth brushing do similar things without the risk of tooth fracture, esophageal obstruction, or gastrointestinal perforation that bones carry.¹⁷ If you find a way to keep your dog's teeth clean that does not involve a bone fragment lodging somewhere it should not, you are doing well.

The VOHC-Accepted dental chew with the most peer-reviewed efficacy data behind it is the original Greenie. It is soft enough to bend rather than fracture canine teeth — the mechanism that makes raw bones risky in the dental X-ray archive — and the controlled trials showed measurable plaque and tartar reduction. Size by your dog's weight class, supervise the first several to make sure they actually chew rather than gulp, and count the calories.

The home-cooked question#

I want to spend a moment here because home-cooked is the option I see owners reach for when they have lost trust in the pet-food industry but are afraid of raw, and it is also the option with the highest potential for invisible harm.

A 2013 study in JAVMA evaluated 200 home-prepared maintenance recipes for adult dogs from 34 sources, including pet care books, websites, and veterinary textbooks. The investigators found that 95% of the recipes had at least one essential nutrient below the recommended allowance, and 83% had multiple deficiencies.¹⁸ A separate study of homemade recipes for dogs with chronic kidney disease found similarly poor nutritional adequacy.¹⁹ These are not edge cases. This is the modal outcome for "I'll just cook for my dog using a recipe I found."

Home cooking can be done safely. The way to do it safely is to use a recipe formulated specifically for your dog by a board-certified veterinary nutritionist, or to use BalanceIT.com — a formulation tool developed by Dr. Sean Delaney, a board-certified veterinary nutritionist, which is widely used in veterinary teaching hospitals and produces a customized vitamin-mineral premix to balance whatever protein-and-starch base you choose.²⁰ If you go this route, you also need to recheck the formulation any time your dog's weight, life stage, or medical status changes meaningfully.

If you have decided home-cooked is the right call for your dog and you want to do it the way the JAVMA recipe-evaluation studies say works, this is the practical implementation. The BalanceIT premix closes the calcium, iodine, copper, manganese, and vitamin-E gaps that the unbalanced-recipe studies kept finding. It is the same product the academic veterinary nutrition world actually uses; cooking without it is the modal failure mode the literature describes.

For owners drawn to the digestibility and coat benefits of raw but stopped by the FDA bacterial-shedding data, air-dried is the middle option that often gets missed in this debate. Higher meat content than kibble, gently processed enough to address the pathogen concerns, and AAFCO-complete by formulation. It is more expensive than kibble and not as cheap as DIY raw, but it is the place a lot of owners land once they read the actual studies and decide they want most of what raw advertises without what raw carries.

What the WSAVA, AVMA, and FDA actually say#

Briefly, because the official positions are part of the evidence picture.

The WSAVA (World Small Animal Veterinary Association) Global Nutrition Committee does not recommend raw meat-based diets for healthy pets in typical households, on the basis of bacterial-contamination risk to humans and pets and risk of nutritional imbalance in homemade raw recipes.²¹ The WSAVA's "Recommendations on Selecting Pet Foods" guidelines instead direct owners to ask the manufacturer specific questions: who formulates the diet (ideally a board-certified nutritionist), what the manufacturer's quality control program looks like, whether the company performs AAFCO feeding trials or only formulates to meet the profile, and whether they will share a complete nutrient analysis on request.²²

The AVMA (American Veterinary Medical Association) has a formal policy discouraging the feeding of raw or undercooked animal-source protein to dogs and cats due to documented public health risks.²³

The FDA does not ban raw pet foods but issues regular recalls of contaminated raw products and publishes guidance for owners who choose to feed raw, focused on safe handling, hygiene, and household-member risk.²⁴

The kibble camp reads this and says "case closed." The raw camp reads this and says "the institutions are captured by industry." The honest reading is somewhere in between: the institutions are reading the published evidence the same way I am reading it, and the published evidence is genuinely lopsided, but the institutions also have not aggressively funded the long-term outcome studies that would resolve the question more definitively. Both can be true.

Where the evidence actually sits#

Pulling all of this together, here is the most honest summary I can give:

1. There is no peer-reviewed evidence that dogs fed raw live longer or are healthier over a lifetime than dogs fed a well-formulated cooked or extruded diet. The long-term outcome studies that would settle this do not exist. What we have is short-term digestibility, palatability, and biomarker work.

2. There is robust peer-reviewed evidence that raw meat–based diets carry meaningful bacterial-contamination and shedding risk, both to the dog and to the humans who share the dog's home. This evidence is the strongest part of the picture and the part that drives the AVMA, FDA, and WSAVA positions.

3. The shiny-coat, firmer-stool, cleaner-teeth observations from raw feeders are real but largely explained by nutrient density, fat content, and chewing behavior — not by rawness itself. A high-quality fresh-cooked or premium extruded diet with adequate fat and a sensible carbohydrate level can deliver similar visible outcomes without the pathogen load.

4. Home-cooked is the riskiest of the three categories for invisible nutritional inadequacy unless the recipe is formulated by a credentialed veterinary nutritionist or via BalanceIT.

5. AAFCO is a floor, not a ceiling. Meeting AAFCO does not mean a diet is optimal. It means it has cleared a regulatory minimum. The BEG-DCM episode is a real reminder that the floor can have cracks.

6. The pet-food industry deserves some of the skepticism it gets, particularly around the use of by-product meals of unclear origin, the heavy carbohydrate inclusion in cheaper kibbles, and the marketing-vs-formulation gap. That skepticism does not, however, validate raw feeding as the alternative — it validates careful selection within the cooked-and-balanced category.

What I'd do#

If you are deciding for a healthy adult dog and you trust me to make a recommendation:

I would feed a complete-and-balanced diet — kibble, fresh-cooked subscription, or freeze-dried — from a manufacturer that employs a board-certified veterinary nutritionist on staff, performs AAFCO feeding trials (not just paper formulation), shares full nutrient analyses on request, and has not had a serious recall in recent years. The WSAVA's manufacturer questions are the screening tool I actually use.

I would not feed commercial raw or homemade raw to a healthy household pet, especially in a home with anyone immunocompromised, with infants, or with elderly relatives. The evidence on bacterial shedding is too clear for me to recommend it knowing what I know.

I would not home-cook unless I were working with a board-certified veterinary nutritionist or using BalanceIT, and I would re-check the formulation any time the dog's status meaningfully changed.

I would prioritize body condition score over brand name. Keeping a dog at a lean 4–5 out of 9 on the body condition scale does more for joint health, longevity, and disease risk than any feeding-philosophy debate I have ever seen.²⁵

Whatever feeding philosophy you land on, an EPA/DHA omega-3 from a credible cold-water-fish source is one of the few add-ons that is well-supported across the canine literature for inflammation, coat, joint health, and cognitive aging. It is one of the cheapest interventions that holds up in peer-reviewed work — and unlike most of the supplement aisle, the dosing is studied rather than vibes.

And if you have been feeding raw for years and your dog is thriving and your household has no vulnerable members, you are not a bad owner. You are a person who reasonably weighed the evidence differently than I did. I would just ask you to handle the food the way a hospital handles raw chicken, and to keep an eye on your dog's stool culture if your vet suggests it.

A note from Karen: I know food is one of the most personal things you can give to a dog you love. Whatever you decide, the fact that you read 2,500 words trying to get it right is already most of the work. Your dog is lucky.

Sources#

Footnotes#

1. Buff, P. R., Carter, R. A., Bauer, J. E., & Kersey, J. H. (2014). Natural pet food: A review of natural diets and their impact on canine and feline physiology. Journal of Animal Science, 92(9), 3781–3791. https://doi.org/10.2527/jas.2014-7789 ↩

2. American Veterinary Medical Association. (2012, revised 2024). Policy on Raw or Undercooked Animal-Source Protein in Cat and Dog Diets. https://www.avma.org/resources-tools/avma-policies/raw-or-undercooked-animal-source-protein-cat-and-dog-diets ↩

3. vonHoldt, B. M., Pollinger, J. P., Lohmueller, K. E., et al. (2010). Genome-wide SNP and haplotype analyses reveal a rich history underlying dog domestication. Nature, 464(7290), 898–902. https://doi.org/10.1038/nature08837 ↩

4. Algya, K. M., Cross, T. L., Leuck, K. N., et al. (2018). Apparent total-tract macronutrient digestibility, serum chemistry, urinalysis, and fecal characteristics, microbiota, and metabolites of adult dogs fed extruded, mildly cooked, and raw diets. Journal of Animal Science, 96(9), 3670–3683. https://doi.org/10.1093/jas/sky235 ↩

5. Rumbeiha, W., & Morrison, J. (2011). A review of class I and class II pet food recalls involving chemical contaminants from 1996 to 2008. Journal of Medical Toxicology, 7(1), 60–66. https://doi.org/10.1007/s13181-010-0123-5 ↩

6. Association of American Feed Control Officials. (2024). AAFCO Methods for Substantiating Nutritional Adequacy of Dog and Cat Foods. https://www.aafco.org ↩ ↩²

7. Davies, R. H., Lawes, J. R., & Wales, A. D. (2019). Raw diets for dogs and cats: A review, with particular reference to microbiological hazards. Journal of Small Animal Practice, 60(6), 329–339. https://doi.org/10.1111/jsap.13000 ↩

8. Stockman, J., Fascetti, A. J., Kass, P. H., & Larsen, J. A. (2013). Evaluation of recipes of home-prepared maintenance diets for dogs. Journal of the American Veterinary Medical Association, 242(11), 1500–1505. https://doi.org/10.2460/javma.242.11.1500 ↩

9. U.S. Food and Drug Administration. (2014). Get the Facts! Raw Pet Food Diets Can Be Dangerous to You and Your Pet. (Summary of FDA two-year sampling study, 2010–2012.) https://www.fda.gov/animal-veterinary/animal-health-literacy/get-facts-raw-pet-food-diets-can-be-dangerous-you-and-your-pet ↩

10. Finley, R., Reid-Smith, R., Ribble, C., et al. (2008). The occurrence and antimicrobial susceptibility of Salmonellae isolated from commercially available canine raw food diets in three Canadian cities. Zoonoses and Public Health, 55(8–10), 462–469. https://doi.org/10.1111/j.1863-2378.2008.01147.x ↩

11. van Bree, F. P. J., Bokken, G. C. A. M., Mineur, R., et al. (2018). Zoonotic bacteria and parasites found in raw meat-based diets for cats and dogs. Veterinary Record, 182(2), 50. https://doi.org/10.1136/vr.104535 ↩

12. U.S. Centers for Disease Control and Prevention. (2024). Raw Diets for Pets. https://www.cdc.gov/healthypets/publications/raw-pet-food.html ↩

13. Freeman, L. M., Stern, J. A., Fries, R., Adin, D. B., & Rush, J. E. (2018). Diet-associated dilated cardiomyopathy in dogs: What do we know? Journal of the American Veterinary Medical Association, 253(11), 1390–1394. https://doi.org/10.2460/javma.253.11.1390 ↩

14. Kerr, K. R., Vester Boler, B. M., Morris, C. L., Liu, K. J., & Swanson, K. S. (2012). Apparent total tract energy and macronutrient digestibility and fecal fermentative end-product concentrations of domestic cats fed extruded, raw beef-based, and cooked beef-based diets. Journal of Animal Science, 90(2), 515–522. https://doi.org/10.2527/jas.2010-3266 (Cat data; methodology and effect direction relevant; flagged as feline.) ↩

15. Do, S., Phungviwatnikul, T., de Godoy, M. R. C., & Swanson, K. S. (2021). Nutrient digestibility and fecal characteristics, microbiota, and metabolites in dogs fed human-grade foods. Journal of Animal Science, 99(2), skab028. https://doi.org/10.1093/jas/skab028 ↩

16. Marx, F. R., Machado, G. S., Pezzali, J. G., et al. (2016). Raw beef bones as chewing items to reduce dental calculus in Beagle dogs. Australian Veterinary Journal, 94(1–2), 18–23. https://doi.org/10.1111/avj.12394 ↩

17. Veterinary Oral Health Council. (2024). VOHC Accepted Products for Dogs. http://www.vohc.org ↩

18. Stockman, J., Fascetti, A. J., Kass, P. H., & Larsen, J. A. (2013). Evaluation of recipes of home-prepared maintenance diets for dogs. Journal of the American Veterinary Medical Association, 242(11), 1500–1505. https://doi.org/10.2460/javma.242.11.1500 ↩

19. Larsen, J. A., Parks, E. M., Heinze, C. R., & Fascetti, A. J. (2012). Evaluation of recipes for home-prepared diets for dogs and cats with chronic kidney disease. Journal of the American Veterinary Medical Association, 240(5), 532–538. https://doi.org/10.2460/javma.240.5.532 ↩

20. Delaney, S. J. (2024). BalanceIT — Veterinary-formulated home-cooked diet tool. https://secure.balanceit.com (Developed and maintained by Sean J. Delaney, DVM, MS, DACVIM (Nutrition).) ↩

21. WSAVA Global Nutrition Committee. (2014, updated 2024). Recommendations on Selecting Pet Foods. World Small Animal Veterinary Association. https://wsava.org/global-guidelines/global-nutrition-guidelines/ ↩

22. Freeman, L., Becvarova, I., Cave, N., et al. (2011). WSAVA nutritional assessment guidelines. Journal of Small Animal Practice, 52(7), 385–396. https://doi.org/10.1111/j.1748-5827.2011.01079.x ↩

23. American Veterinary Medical Association. (2012, revised 2024). Policy on Raw or Undercooked Animal-Source Protein in Cat and Dog Diets. https://www.avma.org/resources-tools/avma-policies/raw-or-undercooked-animal-source-protein-cat-and-dog-diets ↩

24. U.S. Food and Drug Administration. Compliance Policy Guide Sec. 690.800 — Salmonella in Food for Animals, and ongoing recalls and guidance pages on raw pet foods. https://www.fda.gov/animal-veterinary ↩

25. Kealy, R. D., Lawler, D. F., Ballam, J. M., et al. (2002). Effects of diet restriction on life span and age-related changes in dogs. Journal of the American Veterinary Medical Association, 220(9), 1315–1320. https://doi.org/10.2460/javma.2002.220.1315 ↩