Walk into any independent pet store and you’ll find raw food advocates on one side and veterinary nutritionists urging caution on the other. Both cite evidence. Parsing what that evidence actually says — without the marketing layer — takes some work.
What Raw Feeding Proponents Claim
The primary arguments for raw diets center on bioavailability, digestibility, and evolutionary alignment. Proponents argue that cooking denatures proteins and destroys heat-sensitive enzymes and vitamins, reducing nutritional value. Dogs and cats, they note, evolved consuming raw prey — which suggests their digestive systems are equipped for it.
What the Research Shows on Digestibility
A 2019 study published in PLOS ONE compared a commercially prepared raw diet against a dry extruded kibble in dogs. The raw diet showed higher apparent digestibility coefficients for protein (88% vs. 81%) and fat (93% vs. 85%). However, the same study noted that digestibility advantages did not always translate into measurable health outcomes over the six-week trial period. Digestibility is one variable among many.
The Pathogen Problem Is Real
The American Veterinary Medical Association (AVMA) and the FDA both advise against raw meat diets for pets, citing pathogen risk. A 2021 study across 60 raw pet food samples from European commercial products found Salmonella in 15%, Listeria monocytogenes in 32%, and E. coli O157:H7 in 6%. The risk is not only to the pet — contaminated feeding surfaces, bowls, and pet saliva pose transmission risk to immunocompromised household members.
Cooking and Nutrient Loss: A More Nuanced Picture
It’s true that heat destroys some B vitamins (particularly B1 and B6) and vitamin C. However:
- Dogs synthesize their own vitamin C; dietary intake is not essential.
- Commercial cooked diets add back lost vitamins through supplementation, meeting AAFCO standards.
- Cooking actually increases the digestibility of starches, which supports energy extraction in omnivorous dogs.
- For cats, the key concern is taurine — which can be degraded by high-heat processing; reputable manufacturers account for this.
Lightly Cooked Diets: A Middle Ground
Several companies now offer gently or lightly cooked options (temperatures between 70-80°C rather than the 120-150°C of commercial kibble extrusion). A 2022 randomized controlled trial from the University of Illinois found that lightly cooked diets showed digestibility scores comparable to raw, with significantly lower pathogen load. For pet owners concerned about both nutrition and food safety, this format represents the most evidence-supported compromise currently available.
Homemade Diets: The Biggest Risk Nobody Talks About
Whether raw or cooked, homemade pet diets are overwhelmingly nutritionally incomplete. A 2019 survey of 200 homemade dog diet recipes — including those from veterinary websites — found that 95% were deficient in at least one essential nutrient. Calcium-phosphorus imbalance and iodine deficiency were the most common gaps. If choosing homemade, formulation by a board-certified veterinary nutritionist (DACVN) is not optional.
How to Make the Decision for Your Pet
Rather than choosing a camp, choose based on your individual animal. Age, immune status, household members, and specific health conditions all matter. A senior cat with kidney disease has very different needs than a healthy two-year-old Labrador. The most useful conversation is not “raw or cooked” — it is a diet review with a veterinarian who practices evidence-based nutrition.