
You are considering changing your pet’s diet to raw meat dog food. This article provides factual information on the nutritional content and health risks associated with these diets. It helps you understand what the science says about digestion and bacterial contamination. The data comes from multiple studies on commercial raw pet foods.
First, talk to your vet before changing your pet’s diet or treatment
Nutritional Composition Of Raw Meat Dog Food

Freeze-dried raw diets have become more prevalent as of late. Raw or minimally-processed diets contain primarily uncooked ingredients derived from domesticated or wild-caught food animal species. These diets are commercially available in fresh, frozen, freeze-dried, and dehydrated formats. Most raw meat-based diets consist mainly of raw meats, animal by-products, and bones. Chicken is the most representative meat source in these diets. Beef is the second most representative meat source. Salmon is the third most representative meat source [2].
All diets tested in one study had high concentrations of protein and fat [1]. The protein content was over 35% of dry matter basis. The fat content was over 33% of dry matter basis. Fiber concentrations were low, at less than 6%. These diets also had high energy content. The true metabolizable energy values were over 5 kcal/g.
Amino acid digestibilities were high for all diets tested. Most indispensable amino acids had digestibilities greater than or equal to 90%. Histidine and lysine were exceptions to this high digestibility. Histidine digestibility ranged from 82% to 87%. Lysine digestibility ranged from 87% to 92%. The reactive lysine to total lysine ratio indicated minimal heat damage. This ratio ranged from 0.91 to 0.95 for the tested diets. High ratios suggest that the nutritional value of the protein remained intact.
Energy Values And Raw Meat Dog Food
Nitrogen-corrected true metabolizable energy values were most similar to those estimated by Atwater factors [1]. The TMEn values were higher in traditional freeze-dried nuggets and frozen nuggets. Traditional freeze-dried nuggets had a TMEn of 6.1 kcal/g. Frozen nuggets had a TMEn of 5.9 kcal/g. Hybrid freeze-dried nuggets had a lower TMEn of 5.3 kcal/g.
The hybrid diet had lower energy due to the addition of sorghum. Sorghum resulted in a lower fat content in that specific diet. Atwater values produced ME estimates closest to the TMEn values for traditional freeze-dried and frozen diets. Modified Atwater factors underestimated the energy content for all diets tested. The modified Atwater factors produced the lowest ME estimates.
Feeding a high-fat diet can lead to energy excess. This is particularly risky for dogs at high risk of developing acute pancreatitis. Obese dogs are also at risk from high-fat diets. The fat content of commercial frozen raw meat-based diets varied significantly. It ranged between 64 and 92 g fat/Mcal [2]. Some products exceeded the upper safe level for fat set by the NRC.
Bacterial Contamination
Pet food contamination can occur during the manufacturing process, storage, or preparation. Freezing and drying processes may reduce bacterial contamination but do not eradicate it. Raw meat-based diets have been shown to have high microbial contamination. Enterobacteriaceae were detected in all raw meat-based diets in one study [2]. Quantitative aerobic plate counts exceeded unacceptable hygiene thresholds in most samples.
Salmonella spp. and Listeria spp. showed the highest prevalence in some studies [3]. Salmonella was found in 20% of raw meat-based diets in one analysis. Campylobacter was not found in any product in that specific study. However, other studies report Campylobacter as a common pathogen in raw chicken.
Chicken-based diets had a significant relationship with Staphylococcus aureus and Listeria monocytogenes contamination. Contamination by L. monocytogenes was identified in approximately 43% of products with chicken. Frozen products had greater total bacterial counts than freeze-dried products. The survival of pathogens in freeze-dried products was lower than in frozen products. Freeze-drying is not equivalent to cooking. Bacteria can survive in a dried state for decades.
Nutritional Imbalances
Most raw meat-based diets do not contain additives. This potentially poses a risk of nutritional imbalances to adults and growing animals. Many products provided deficient amounts of essential nutrients. Each raw meat-based diet showed at least one concern regarding nutrient content [2].
Mineral imbalances were identified even though products were labelled as complete pet food. Calcium and phosphorus content varied widely among products. The average calcium to phosphorus ratio was 1.6 plus or minus 0.6. Some products had ratios below 1:1. Others had ratios above 2:1.
Zinc and copper content were insufficient in many raw meat-based diets. Zinc was insufficient in 68% of products. Copper was insufficient in 61% of products. Some products had very high zinc and copper concentrations. One product intended for all life stages exceeded the limit for copper. Dietary copper excess is a concern due to hepatopathy in dogs.
Feeding raw diets without mineral sources may lead to mineral deficiencies. Deficient or excessive supply of calcium and phosphorus can cause developmental orthopaedic diseases. Clinical diffuse osteopenia has been reported in growing dogs and cats fed raw diets. Beagle puppies fed a diet providing 300% of calcium requirements showed impaired skeletal development.
Digestibility And Gut Health
Dogs fed raw diets had higher apparent total tract macronutrient digestibilities than those fed extruded diets. Consequently, fecal output was higher in dogs fed the extruded diet. Fecal scores were looser in dogs fed extruded and fresh diets. Fecal pH was lower in dogs fed extruded and fresh diets.
Fecal microbiota were greatly impacted by the diet. The relative abundance of Fusobacteria was higher in dogs fed raw diets. The relative abundance of Actinobacteria and Firmicutes was lower in dogs fed raw diets. Dogs fed raw diets had lower fecal short-chain fatty acid concentrations. This was likely due to low fiber and carbohydrate content.
Fecal output in raw-fed dogs was lower than in extruded-fed dogs. The digestibility of raw diets was higher than some previous studies reported [5]. Individual dog differences and incorporated ingredients affect digestibility. Fiber is essential for stool quality. Raw diets often lack sufficient fiber.
Health Risks For Owners And Pets
Bacteria from raw food can cause diseases in pets and their owners. Children, the elderly, and immunocompromised people are especially at risk. The use of canine raw meat-based diets might increase exposure to zoonotic pathogens. Salmonella, Listeria monocytogenes, and Campylobacter are among these pathogens.
Dogs fed raw food are approximately 6 times more likely to shed bacteria [3]. Salmonella fecal excretion in raw-fed dogs was 24.2% in one study [6]. Pathogens were not detected from extruded food samples or feces from extruded-fed dogs. A large epidemiologic study indicated raw meat consumption was a significant risk factor for Salmonella shedding [4].
The odds of being exposed to a foodborne pathogen in frozen raw meat diets are about 1-out-of-3. This was based on a study by the FDA Center for Veterinary Medicine. You should treat raw products like any other raw meat bought for your family. Handling should be careful to prevent cross-contamination.
What To Do With This Information
Review the nutritional labels of any raw meat dog food you consider [4]. Check for adequate mineral content, especially zinc and copper. Ensure the calcium to phosphorus ratio is balanced. Be aware of the bacterial risks associated with frozen raw diets. Handle raw food with the same hygiene standards as human raw meat. Keep raw food away from high-risk individuals in your home. Consult your veterinarian if you notice symptoms like diarrhea or vomiting. Consider the potential for nutrient imbalances in growing animals. Monitor your pet’s health closely if you choose this diet. Use the facts here to make an informed decision about your pet’s nutrition.
Sources
- https://pmc.ncbi.nlm.nih.gov/articles/PMC10583971/
- https://pmc.ncbi.nlm.nih.gov/articles/PMC9495138/
- https://pmc.ncbi.nlm.nih.gov/articles/PMC7566254/
- https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-topics/raw-foods-dogs-evidence-based-advice-riney-canine-health-center
- https://pmc.ncbi.nlm.nih.gov/articles/PMC11648562/
- https://pmc.ncbi.nlm.nih.gov/articles/PMC9339799/
