Plant-Based vs. Meat-Based Dog Food: A Science-Based Comparison

By Caroline Buck, Co-founder of Petaluma

Dogs share a common ancestor with wolves, so it is natural to assume they need meat to stay healthy. But dogs are not wolves. As they evolved alongside people, scavenging the scraps of human settlements, they became omnivores that need a set of nutrients, not meat itself. This guide compares plant-based and meat-based dog food on the things that matter, protein, digestibility, health, and sustainability, and shows where each one stands.

Do dogs actually need meat?

Dogs and wolves split from a common ancestor thousands of years ago, and dogs then adapted to life alongside people. That shared diet left a mark in their genes: dogs carry extra copies of the genes used to digest starch, which wolves do not have (Axelsson 2013). That makes dogs omnivores, built to handle plants and grains, not obligate carnivores like cats.

So the real question is not whether a dog eats meat, but whether it gets the nutrients it needs. As University of Illinois researcher Kelly Swanson put it, "animals don't have ingredient requirements, they have nutrient requirements." A dog can get those nutrients from meat, from plants, or from a mix, as long as they are all present and in balance. For a deeper look, see our review of whether dogs are omnivores or carnivores.

Protein, nutrients, and digestibility

Animal protein's biggest advantage is that it is complete. A single meat supplies every essential amino acid a dog needs, which keeps a recipe simple. Meat also delivers some nutrients in ready-to-use form, including taurine, vitamin B12, and preformed vitamin D.

The trade-offs are safety and heat. Meat has to be cooked, or carefully handled if fed raw. And while fresh meat is highly digestible, the high heat used to make most dry foods lowers that digestibility and can form advanced glycation end products (AGEs), compounds linked to inflammation.

Plant proteins can meet the same needs. Some, like soy, are complete on their own; others, like peas or chickpeas, are a little short on certain amino acids, so pairing complementary proteins covers the full set. Micronutrients like B12, vitamin D, taurine, and L-carnitine are usually added as a premix, which most dog foods do regardless of protein source. A good plant-based food makes sure they are all there. You can read the full breakdown in our guide to plant-based proteins for dogs.

Digestibility is a common worry with plant-based food, and it comes down to the recipe. A University of Illinois study found human-grade vegan dog foods were well digested and met AAFCO nutrient profiles (U of I 2023). The best brands remove the guesswork by publishing their own results. Petaluma's protein measured 93% digestibility in university testing, a level that matches or beats typical meat-based kibble.

Health and sustainability

On health, the evidence has been building for years. Plant-based dog foods have been on the market for decades, and a growing body of peer-reviewed research now supports the safety of well-formulated meat-free diets. In an owner survey of 2,536 dogs, those fed plant-based diets were reported to have fewer health problems than dogs on conventional meat-based food (Knight 2022). Much of the long-term data is still owner-reported, so more controlled trials will keep sharpening the picture, but the findings so far point the same way.

Sustainability is where the gap is widest. Meat is the biggest driver of pet food's environmental footprint. Global pet food is estimated to produce 56 to 151 million tonnes of carbon dioxide a year, and meat-based diets carry a far larger impact than plant-based ones (Alexander 2020). Feeding plant-based is one of the most effective ways to lower a dog's dietary footprint. More on that in our look at the carbon footprint of pet food.

Plant-based vs. meat-based, side by side

Factor	Meat-based	Plant-based
Protein	Complete and highly digestible	Complete when combined and balanced
Nutrients like taurine, B12, vitamin D	Come preformed in meat	Added directly to the recipe
Digestibility	Generally high	High in well-cooked, well-formulated recipes
Common allergens	Beef, chicken, and dairy are frequent triggers	Avoids the common animal allergens
Environmental footprint	Higher	Lower

Where Petaluma fits

Petaluma is a complete plant-based food formulated by veterinary nutritionists and AAFCO complete and balanced. It delivers the protein and every essential nutrient a dog would get from meat, with taurine, B12, vitamin D, and L-carnitine built in. Because it is built from plants, it also carries a smaller environmental footprint and leaves out the common meat allergens. For the science behind that, see our review of whether dogs can thrive on plant-based diets.

Frequently asked questions

Do dogs need meat to survive?

No. Dogs are omnivores, so they need specific nutrients, not meat itself. A complete plant-based food supplies the same protein, vitamins, and minerals a dog would get from meat, as long as it is properly formulated and meets AAFCO standards. Cats, by contrast, are true carnivores and do need animal-based nutrients.

Are dogs carnivores or omnivores?

Dogs are omnivores. As they evolved alongside humans, they gained extra copies of the genes used to digest starch, which their wolf ancestors lack (Axelsson 2013). That is why dogs handle plants and grains well, unlike obligate carnivores such as cats.

Is plant-based dog food better than meat-based?

Neither is automatically better. Both can be complete and healthy when properly formulated. A plant-based food avoids the common meat allergens and has a smaller environmental footprint, while a meat-based food delivers some nutrients preformed. What matters most is whether the recipe is AAFCO complete and balanced.

Can dogs get enough protein without meat?

Yes. Plant proteins like peas, chickpeas, and soy can meet a dog's protein and amino acid needs when a recipe is balanced and supplemented where needed. A University of Illinois study found well-formulated vegan dog foods were well digested and met AAFCO nutrient profiles (U of I 2023).

Is plant-based dog food more environmentally friendly?

Yes. Meat is the biggest driver of pet food's environmental footprint, and plant-based diets have a far smaller impact than meat-based ones (Alexander 2020). Feeding plant-based is one of the most effective ways to lower a dog's dietary footprint.

Is meat-based or plant-based dog food more digestible?

Animal protein is highly digestible, and so is a well-cooked, well-formulated plant-based food. In one university study, human-grade vegan dog foods showed good digestibility and met AAFCO profiles (U of I 2023). Digestibility depends more on the quality of the recipe than on whether it contains meat.

Related reading: Can dogs thrive on plant-based diets? / Are dogs omnivores or carnivores? / Plant-based proteins for dogs.

References

1. Axelsson E, et al. The genomic signature of dog domestication reveals adaptation to a starch-rich diet. Nature. 2013;495(7441):360–364. Nature.
2. University of Illinois (Swanson lab). Amino acid digestibility and metabolizable energy of mildly cooked human-grade vegan dog foods. Transl Anim Sci. 2023;7(1):txad020. Journal.
3. Knight A, Huang E, Rai N, Brown H. Vegan versus meat-based dog food: guardian-reported health outcomes in 2,536 dogs. PLOS ONE. 2022;17(4):e0265662. PubMed.
4. Alexander P, et al. The global environmental paw print of pet food. Global Environmental Change. 2020;65:102153. ScienceDirect.