Raw food diets for dogs are popular, but the scientific evidence behind them is thin. Most claimed benefits remain unsupported by rigorous research, while the risks, particularly bacterial contamination, are well documented. Both the American Veterinary Medical Association (AVMA) and the American Animal Hospital Association (AAHA) officially recommend against feeding raw or undercooked animal-source protein to pets.
That doesn’t mean raw diets have zero merit, but the gap between what proponents promise and what the science actually shows is wide. Here’s what the evidence says.
What a Raw Dog Food Diet Looks Like
Raw feeding generally follows one of two models. The first, often called BARF (Biologically Appropriate Raw Food), combines raw meat, bones, and organ meat with vegetables, fruits, seeds, and supplements. The second, Prey Model Raw (PMR), skips plant matter entirely and aims for a ratio of roughly 80% muscle meat, 10% bone, 5% liver, and 5% other organs. Both approaches require careful portioning to avoid nutritional gaps, and neither comes with built-in quality controls the way commercial kibble does.
What the Science Says About Benefits
Proponents claim raw diets improve everything from coat quality and dental health to behavior and chronic disease. The reality is more modest. A review in the Journal of Small Animal Practice found formal evidence for only two benefits: changes in the gut microbiome and subjectively improved stool quality. Dogs on raw diets tend to produce smaller, firmer stools, likely because the food is more digestible with less filler than processed kibble.
Claims about dental health are a good example of how the evidence gets overstated. Feral and wild dogs do tend to have less tarite buildup than pet dogs, and chewing raw bones may contribute to that. But the limited published research does not support the broader claim that raw feeding actually prevents periodontal disease.
As for the sweeping claims that raw diets prevent cancer, resolve allergies, cure inflammatory conditions, or improve behavior, the same review found “neither robust evidence nor identified plausible mechanisms” behind them. These remain a mixture of anecdote and opinion.
Bacterial Contamination Is the Biggest Risk
This is where the evidence is strongest, and not in raw feeding’s favor. Studies on raw pet food in the United States have found Salmonella contamination rates between 7% and 44%. An FDA study of 196 raw pet food samples found 15 positive for Salmonella and 32 positive for Listeria. AAHA cites research showing 30% to 50% of raw protein diets are contaminated with disease-causing organisms.
Dogs can eat contaminated food and appear perfectly healthy while still shedding dangerous bacteria in their stool. Up to 30% of dogs fed raw diets may shed pathogens this way. That means your dog doesn’t need to look sick to be spreading Salmonella or Listeria around your home, on your floors, on your furniture, and on you when they lick your face.
The Risk Extends to Your Household
This is the detail many raw-feeding guides gloss over. The contamination risk isn’t limited to your dog. You can pick up Salmonella or Listeria from handling raw pet food, from surfaces where the food was prepared, from your dog’s bowl, or from your dog’s saliva. The FDA specifically warns against letting a raw-fed dog lick your face and recommends thorough handwashing after any contact with the dog or its food.
The people most vulnerable are young children, older adults, pregnant women, and anyone with a weakened immune system. If someone in your household falls into any of these categories, the risk calculation shifts significantly. AAHA also specifically warns that therapy dogs involved in animal-assisted programs should never be fed raw diets, because of the transmission risk to the people they visit.
Nutritional Gaps Are Common
Formulating a nutritionally complete diet from raw ingredients is harder than it looks. Commercial kibble is engineered to meet established nutrient profiles. A homemade raw diet requires precise balancing of calcium, phosphorus, vitamins, and trace minerals, and getting it wrong can cause real harm over time. Too little calcium relative to phosphorus, for instance, can weaken bones, particularly in growing puppies. Too much liver means excessive vitamin A, which is toxic in large amounts.
Even commercially prepared raw diets aren’t guaranteed to be balanced. Without the heating process that conventional pet food undergoes, raw diets also skip a step that can improve the bioavailability of certain nutrients. If you’re feeding raw, working with a veterinary nutritionist to formulate or verify the diet is essential rather than optional.
Where Veterinary Organizations Stand
The major veterinary bodies are unusually unified on this topic. The AVMA “discourages the feeding of any raw or undercooked animal-source protein to cats and dogs” because of illness risk to both pets and humans. The AAHA states it “does not advocate nor endorse feeding pets any raw or dehydrated nonsterilized foods, including treats that are of animal origin,” citing “overwhelming scientific evidence.” Cornell University’s Riney Canine Health Center advises owners who do feed raw to watch carefully for diarrhea, vomiting, or behavioral changes as signs of trouble.
These aren’t fringe positions. They reflect the current weight of published evidence, which consistently shows documented risks and largely unproven benefits.
If You Still Choose to Feed Raw
Some owners weigh the evidence and decide to proceed anyway, whether because their dog has specific dietary needs or because they’ve seen improvements they attribute to the diet. If that’s you, minimizing risk comes down to hygiene discipline and nutritional oversight.
- Handle raw pet food like raw chicken. Wash your hands for at least 20 seconds with soap and water after touching it. Clean all surfaces, utensils, and cutting boards with hot soapy water immediately after preparation.
- Store it separately. Keep raw pet food in sealed containers so juices can’t leak onto other items in your refrigerator.
- Clean the bowl after every meal. Don’t let uneaten raw food sit out. Discard leftovers daily.
- Limit face contact. Avoid letting your dog lick your face, especially right after eating.
- Pick up stool promptly. Dogs shedding bacteria in their feces can contaminate yards and shared spaces.
- Get the nutrition verified. Have a veterinary nutritionist review the diet’s formulation, not just a recipe you found online.
- Monitor your dog. Watch for vomiting, diarrhea, lethargy, dull coat, or changes in behavior. These can signal contamination or nutritional imbalance.
The bottom line is that raw feeding carries real, measurable risks and offers benefits that are, for the most part, unproven beyond improved stool quality. That doesn’t make it impossible to do safely, but it does mean the burden of making it work falls entirely on you.