If you’ve ever thought about feeding your dog a plant-based diet, you’ve probably gotten the look. That skeptical side-eye from friends, family, or even your vet. “Dogs are carnivores,” they say. “They need meat.”
Nonsense.
Here’s the thing: that outdated, unstudied information is increasingly being challenged by a growing body of peer-reviewed science. As of 2025, more than ten published studies have examined the safety and health outcomes of plant-based diets for dogs, and the results may surprise you.
In this article, we’ll walk you through exactly what the research says, address the most common concern (the DCM scare), explain what nutrients dogs genuinely need, and give you a clear framework for choosing a high-quality plant-based dog food.
Yes — dogs can thrive on a properly formulated plant-based diet. Dogs are omnivores, not strict carnivores, and multiple peer-reviewed studies confirm they can meet all their nutritional needs from plant and synthetic sources when the diet is complete and balanced. The key phrase is “complete and balanced” — formulation matters enormously. Always look for AAFCO-certified plant-based dog foods.
Are Dogs Carnivores or Omnivores? The Biology Explained
The belief that dogs are carnivores comes from the fact that they evolved from wolves, animals that are, indeed, primarily meat-eaters. But dogs and wolves diverged thousands of years ago, and that evolutionary journey changed them in fundamental ways.
Research published in the journal “Nature” identified that dogs carry 10 diet-related genes that wolves simply don’t have. These include multiple copies of the AMY2B gene, which produces amylase, the enzyme responsible for breaking down starch. Wolves carry just two copies. This genetic adaptation is a direct response to millennia of living alongside humans and sharing our plant-rich diets.
In plain terms: dogs evolved to digest carbohydrates and plant matter. They are biologically omnivores, capable of deriving nutrition from both animal and plant sources. As veterinarian Dr. Annika Linde, co-author of a landmark 2024 PLOS ONE study, put it:
“Dogs need specific nutrients. They don’t need specific ingredients.”
— Dr. Annika Linde, DVM, PLOS ONE Study Co-Author (2024)
What Does the Science Actually Say? Key Studies Reviewed
The research on plant-based canine diets has grown significantly in recent years. Here are the studies that matter most:
The 2024 PLOS ONE Study: 3,000 Health Parameters Over 12 Months
This is the gold standard study for this topic. Published in the respected scientific journal PLOS ONE in April 2024, researchers followed 15 dogs over a full year, measuring more than 3,000 individual health parameters while the dogs were fed V-Dog, a commercially available plant-based kibble.
The result? The dogs thrived. There were no significant negative health changes detected across the year-long trial. The study has since been adapted into a Netflix documentary and has become one of the most widely cited pieces of evidence supporting plant-based diets for dogs.
University of Illinois Study: Digestibility and Nutrition
Researchers at the University of Illinois tested two human-grade, lightly cooked vegan dog foods and found that plant-based protein digestibility was comparable to leading meat-based pet foods, and that plant-based fat absorption was actually higher. Dogs in the study also demonstrated improved gut microbiome diversity, beneficial changes in fecal metabolites, and weight maintenance or loss.
Dr. Andrew Knight’s Population Studies (Multiple Years)
UK veterinarian Dr. Andrew Knight has authored or co-authored several of the most important studies in this space. Analyzing data from thousands of dogs, he concluded that nutritionally complete plant-based diets are among the healthiest dietary choices for dogs, outperforming both conventional meat-based diets and raw meat diets in health outcomes.
His 2022 study, published in PLOS ONE, examined guardian-reported health indicators across 2,536 dogs and found that dogs on plant-based diets showed fewer signs of poor health, required fewer vet visits, and were less reliant on medications.
Vienna Veterinary University (2014): No Nutritional Deficiencies
Researcher Semp began this study with a hypothesis: that dogs on a vegan diet would show deficiencies in iron and B12. Her findings completely contradicted her prediction. Dogs on a complete plant-based diet showed no significant deviations from dogs on conventional meat-based diets, leading her to conclude that plant-based diets can assure a healthy lifestyle in dogs.
What the British Veterinary Association Said in 2024
In July 2024 the British Veterinary Association published a policy position on diet choices for cats and dogs. It states plainly that it is possible to feed dogs a plant-based diet, while cautioning that owners should be aware of the difficulty of balancing these diets, the lack of robust long-term safety data, and the need to monitor their dog’s health over time. Coming from a major veterinary body, that acknowledgment matters. It is not an endorsement, and the BVA notes that much of the supporting research is small-scale and owner-reported.
What About the DCM Scare? Here’s the Truth
If you’ve spent any time researching plant-based dog food, you’ve probably encountered alarming headlines about dilated cardiomyopathy (DCM), a serious heart condition, being linked to non-meat diets. Let’s unpack this carefully, because the reality is more nuanced than the headlines suggest.
What Actually Happened
In 2018, the FDA began investigating a spike in DCM cases in dogs. The foods associated with these cases were overwhelmingly grain-free diets, not plant-based diets. Specifically, more than 90% of the implicated foods were grain-free, and 93% contained high amounts of peas or lentils as primary ingredients.
Critically: this is grain-free food with high legume content. This is not the same as a nutritionally complete plant-based diet formulated by veterinary nutritionists.
The FDA’s Own Conclusion
In December 2022, the FDA announced it would not provide further updates on the DCM investigation because no causal link between any specific dietary pattern and DCM had been established. The agency described DCM as “a complex medical condition that may be affected by multiple factors such as genetics, underlying medical conditions, and diet.”
In other words: the science did not prove grain-free or legume-rich diets cause DCM. Correlation was observed in some populations, causation was not established.
Later evidence points the same way. An 18-month randomized, double-blind trial of 60 dogs published in the Journal of Animal Science in 2025 compared grain-free diets with peas, grain-inclusive diets with peas, and grain-free diets without peas. It found no clinically significant changes in cardiac function in any group, and taurine levels stayed normal throughout.
The Important Nuance
To be responsible, it’s worth noting that some ongoing research still finds associations between high-pulse diets and certain cardiac markers in specific breeds, particularly Golden Retrievers, Irish Wolfhounds, and some other large breeds. If you have one of these breeds, it’s worth discussing with your vet and choosing a plant-based food that has been AAFCO-tested through feeding trials (not just nutrient analysis).
The DCM scare was primarily about grain-free, legume-heavy conventional foods — not properly formulated, AAFCO-certified plant-based diets. No causal link was ever established. That said, always choose a complete and balanced food with feeding trial certification, and consult your vet if you have a breed with known cardiac predispositions.
What Nutrients Do Dogs Actually Need on a Plant-Based Diet?
The key to any dog’s health, regardless of diet type, is nutritional completeness. Here are the nutrients that require the most attention on a plant-based diet, and how quality brands address them:
Protein & Essential Amino Acids: Dogs need 10 essential amino acids. Plant-based sources like pea protein, soy, and lentils can provide these when properly combined and formulated. Look for foods that meet AAFCO minimum protein requirements.
Taurine: While dogs can synthesize taurine from other amino acids, some breeds have reduced efficiency. Quality plant-based foods supplement taurine directly. This is especially important for breeds with known predispositions (Golden Retrievers, Cocker Spaniels).
Vitamin B12: Not naturally found in plants but easily added as a supplement. All reputable plant-based dog foods include synthetic B12.
Vitamin D3: Plant-based D2 is less bioavailable than animal-derived D3. Look for foods using algae-based D3, which is vegan and highly bioavailable.
Omega-3 Fatty Acids (DHA/EPA): Traditionally from fish oil. Quality vegan brands use algae-based omega-3s, the same source fish get their omega-3s from, cutting out the middleman.
L-Carnitine: An amino acid important for energy metabolism. Naturally low in plants but easily supplemented.
Calcium & Phosphorus: Essential for bone health. Plant-based foods typically use calcium carbonate or calcium phosphate as supplements.
Signs Your Dog Is Thriving on a Plant-Based Diet
Whether you’ve just made the switch or are considering it, here’s what a thriving dog on a plant-based diet typically looks like:
Consistent energy levels and enthusiasm for play and exercise
Healthy coat. Shiny, soft, without excessive shedding or dryness, although shedding and dryness can be from other factors not related to diet.
Firm, regular stools (a sign of good digestibility and gut health)
Clear, bright eyes and healthy skin without excessive itching
Healthy weight and muscle tone
Regular vet checkups showing normal bloodwork — especially B12, iron, and taurine levels
If you notice lethargy, persistent digestive issues, dull coat, or weight loss after a switch, consult your vet. These can indicate that the specific food being used isn’t meeting your dog’s individual needs, not necessarily that plant-based diets don’t work.
How to Choose a Quality Plant-Based Dog Food
Not all plant-based dog foods are created equal. Here’s the checklist to use when evaluating any plant-based dog food:
AAFCO “complete and balanced” statement: This means the food meets minimum nutritional requirements. Ideally, look for foods that have passed feeding trials (not just nutrient analysis).
Formulated by a board-certified veterinary nutritionist: Brands like Pawco Foods, Wild Earth, V-Dog, and Petaluma work with veterinary nutritionists to ensure their formulations are complete.
Taurine and L-carnitine supplementation: Check the ingredient list. These should be explicitly included.
Algae-based DHA/EPA: Look for DHA supplementation from algae oil rather than fish oil if you want a fully plant-based product.
Transparent ingredient sourcing: Reputable brands are open about where their ingredients come from and how their food is tested.
Frequently Asked Questions
Can puppies eat a plant-based diet?
Puppies have higher nutritional demands than adult dogs, particularly for protein, calcium, and DHA for brain development. While some AAFCO-certified plant-based foods are formulated for “all life stages” (which includes puppies), we strongly recommend consulting a veterinary nutritionist before putting a puppy on a plant-based diet. Don’t take chances during critical developmental windows.
Will my dog get enough protein on a plant-based diet?
Yes — provided you choose a complete and balanced food. Pea protein, soy protein, and other plant proteins can provide all essential amino acids in the correct ratios. Studies confirm protein digestibility from quality plant-based dog foods is comparable to meat-based alternatives.
Do vets recommend plant-based diets for dogs?
Veterinary opinion is shifting. In 2024 the British Veterinary Association acknowledged that it is possible to feed dogs a plant-based diet, while urging owners to balance the diet carefully and monitor long-term health. Many progressive veterinarians now support plant-based diets as a valid option when the food is properly formulated. That said, you may still encounter vets who are skeptical. If that’s the case, ask them specifically about the studies published in PLOS ONE and the Journal of Animal Science, which are peer-reviewed and difficult to dismiss.
Is a plant-based diet good for dogs with allergies?
Potentially yes, and this is one of the most compelling reasons many pet parents explore plant-based feeding. The most common food allergens in dogs are chicken, beef, dairy, and wheat. By removing animal proteins entirely, plant-based diets can eliminate these triggers. This is why elimination diets for dogs with suspected dog food allergies often use novel plant proteins like pea or potato as the protein base.
What plant-based dog food brands are the most reputable?
Among the most well-established and scientifically supported brands: V-Dog (used in the 2024 PLOS ONE study), Wild Earth (formulated by PhD food scientists), Petaluma (co-founded by veterinary nutrition advocates), Pawco Foods, and Bramble. We’ll be publishing detailed reviews of each of these on plant-basedpets.com — stay tuned.
Can cats eat a plant-based diet too?
Cats are obligate carnivores — unlike dogs, they cannot synthesize certain essential nutrients like taurine and arachidonic acid from plant sources. While plant-based cat food with supplementation exists, the science is much less settled here than for dogs. This is a topic we’ll cover in depth separately.
The Bottom Line
The science is increasingly clear: dogs can thrive on a properly formulated plant-based diet. Across more than ten peer-reviewed studies, including a rigorous year-long trial published in PLOS ONE and large-scale population studies by Dr. Andrew Knight, dogs on nutritionally complete vegan diets show health outcomes that are comparable, and in some cases superior, to those on conventional meat-based diets.
The key word throughout all of this research is “complete and balanced.” Not all plant-based dog foods are equal. Look for AAFCO certification, veterinary nutritionist oversight, and transparent ingredient lists with explicit taurine, B12, and DHA supplementation.
If you’ve been considering a plant-based diet for your dog, the evidence says: it’s worth exploring. And if your dog has specific health concerns like allergies, digestive issues, or a breed predisposition to heart disease, a conversation with your vet about a properly formulated plant-based food may be one of the most important conversations you have for their long-term wellbeing.
Have you switched your dog to a plant-based diet? We’d love to hear your story in the comments below. And if you found this article helpful, share it with a fellow pet parent who’s been asking the same questions.
Sources & Further Reading
Semp, P.V. (2014). Vegan Nutrition of Dogs and Cats. Vienna Veterinary University.
I’m Matt, the founder of plant-basedpets.com and the person behind Bella’s story. After watching my rescue pit bull/boxer mix suffer through years of food allergies, bloody vomiting, and three emergency vet visits in 48 hours, I made the decision to switch her to a plant-based diet — and it changed everything. Three years later, Bella is thriving with zero health incidents. I built this site to share what the science says and help other pet parents find the answers I had to discover on my own. I am not a veterinarian; always consult your vet before making significant dietary changes.
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