<\/em><\/a>Written by Dr. Rhiannon Koehler, DVM, MPH<\/p>\nAs pet parents, we\u2019re tasked with making decisions for our pets. We hope that we\u2019re making the right ones.<\/span><\/p>\nFor vegetarians, it\u2019s common to wonder if your dog could join you in a vegetarian lifestyle, whether you\u2019ve chosen vegetarianism for ethical, environmental, or health-related concerns.<\/strong><\/strong><\/em><\/strong><\/strong><\/em><\/span><\/p>\nIn short, yes dogs can be vegetarians. But like many things in pet care, a simple \u201cyes\u201d or \u201cno\u201d answer doesn\u2019t quite cover it.<\/span><\/p>\n
<\/span><\/p>\nDogs? Wolves? – The Gastrointestinal Tract of Dogs and Diet Formulation<\/strong><\/strong><\/h2>\nRegardless of what you might see in the marketing campaigns of several big-name companies, our dogs aren\u2019t wolves anymore!<\/strong><\/strong><\/em><\/strong><\/strong><\/em><\/p>\nDomestication has changed the structure of their gastrointestinal tract, as well as their nutritional needs. <\/p>\n
While we think of wolves as carnivores, dogs are omnivores, meaning their preferred diet consists of both meat and plants.<\/p>\n
However, like all animals, dogs require specific nutrients rather than specific ingredients.<\/strong><\/strong><\/em><\/strong><\/strong><\/em><\/p>\nThis means a dog\u2019s nutritional needs can be met without meat, though in some cases you may need to provide supplemental minerals, vitamins, or synthetic ingredients. <\/p>\n
<\/span><\/p>\nA recent study comparing the genome of dogs and wolves found that ten genes with important roles in starch digestion and fat metabolism show important differences.<\/strong><\/strong><\/em><\/strong><\/strong><\/em><\/p>\nFor example, wolves only have two copies of the gene for amylase, which is a protein that breaks down starch in the intestine.<\/p>\n
In contrast, dogs have anywhere from 4 to 30 copies. The gene was also 28 times more active in dogs when compared with wolves.<\/strong><\/strong><\/em><\/strong><\/strong><\/em><\/p>\nDogs have also evolved to subsist on a diet lower in protein.<\/p>\n
This research suggests that dogs are much better suited towards metabolizing carbohydrates than wolves.<\/p>\n
<\/span><\/p>\nThe Pros of Vegetarianism for Dogs<\/strong><\/strong><\/h2>\nWhen we think of the benefits and drawbacks of feeding a vegetarian diet, it\u2019s important to note that the overall health impacts of a plant-based diet versus a meat-based diet are still being researched, both in humans and our canine companions.<\/strong><\/strong><\/em><\/strong><\/strong><\/em><\/span><\/p>\nAs far as we know, most of the benefits of feeding your dog a vegetarian diet reflect your ethical values as a vegetarian pet parent.<\/span><\/p>\nIn the United States alone, 34.3 million commercial cattle, 125 million hogs, and 2.07 million sheep and lambs were slaughtered in 2022.2 Over 9.5 billion chickens and 208 million turkeys were slaughtered in the same year.<\/strong><\/strong><\/em><\/strong><\/strong><\/em><\/span><\/p>\nThe meat sources in most commercial diets come from the commercial slaughter of farm animals. <\/span><\/p>\nFor some pet parents, this isn\u2019t a concern. However, for vegetarian pet parents, knowing that their pet\u2019s contribution to animal slaughter is reduced has a lot of meaning.<\/strong><\/strong><\/em><\/strong><\/strong><\/em><\/span><\/p>\nAs far as your dog\u2019s health goes, the jury is still out on the impacts of vegetarian diets. <\/span><\/p>\n
<\/span><\/p>\nIn humans, plant-based diets are associated with fewer chronic health conditions. This may turn out to be true for our canine companions, too, but we cannot assume that because something is true for humans it must also be the case for dogs. <\/strong><\/strong><\/em><\/strong><\/strong><\/em><\/span><\/p>\nThus far, negative health impacts of a complete and balanced vegetarian diet haven\u2019t been noted in dogs.<\/span><\/p>\nOne recent study examining nutritionally balanced vegan diets found that they may be more beneficial than a conventional commercial kibble. <\/span><\/p>\nIn this study, the researchers looked at the prevalence of 22 specific health disorders. Pet parents who had been feeding their dogs a conventional meat, raw meat, or vegan diet for at least one year reported back to the researchers on their pets\u2019 health. <\/strong><\/strong><\/em><\/strong><\/strong><\/em><\/span><\/p>\nThe researchers found that 49% of dogs on a conventional diet and 43% of dogs on a raw meat diet suffered from at least one disorder compared to 36% of the vegan dogs.<\/span><\/p>\nOf course, these results depend on owner-reported observation, so there is some bias. <\/span><\/p>\nFurthermore, there were differences in the groups, with dogs fed a raw meat diet younger on average than the other two groups. <\/span><\/p>\n
<\/span><\/p>\nMuch more evidence is needed to state whether a vegan or vegetarian diet has health benefits for most dog <\/strong><\/strong><\/em><\/strong><\/strong><\/em><\/span><\/p>\nOne known health benefit of a vegetarian diet relates to pups with food allergies. Contrary to popular belief, grains are NOT typically the cause of a dog\u2019s allergies.<\/strong><\/strong><\/strong><\/strong><\/span><\/p>\nTypically, the protein sources in a diet are the leading cause of food allergies in dogs. <\/span><\/p>\nAccording to the Tufts University Cummings School of Veterinary Medicine, the top reported allergens are chicken, beef, dairy, and eggs. <\/strong><\/strong><\/strong><\/strong><\/span><\/p>\nConsequently, feeding a vegetarian diet may be helpful in dogs with food allergies.<\/span><\/p>\nFor folks feeding home-cooked diets to their dogs, vegetarian home-cooked diets also have the benefit of being more affordable than meat-based home-cooked diets. <\/span><\/p>\nHumans who eat a true vegetarian diet spend less money annually on groceries, so it makes sense that the same could be true for those of us feeding our dogs a vegetarian diet.<\/strong><\/strong><\/strong><\/strong><\/span><\/p>\nIf you are home-cooking a vegetarian diet for your dog, make sure to see a veterinary nutritionist to ensure the diet you are providing is complete and nutritionally balanced.<\/span><\/p>\n
<\/span><\/p>\nThe Cons of Vegetarianism for Dogs<\/strong><\/strong><\/h2>\nWhile some pet parents may choose vegetarianism for their dogs due to their ethical values, the same can be said of pet parents who choose meat-based diets for their pets.<\/strong><\/strong><\/strong><\/strong><\/em><\/p>\nQuestions these pet parents may ask themselves include:<\/p>\n
\n- Is it ethical to put your moral values on your dog?<\/span><\/em><\/li>\n
- Is it ethical to refuse your dog a preferred or natural component of their diet or one they have evolved to consume?<\/span><\/em><\/li>\n<\/ul>\n
Evolutionarily, the dog does retain many traits that suggest they\u2019re still adapted towards eating meat as part of its diet.<\/p>\n
Dogs belong to the order Carnivora, meaning their ancestral counterparts subsisted primarily on prey. <\/strong><\/strong><\/strong><\/strong><\/p>\nExamples of traits that suggest they are meant to eat meat as a component of their diet include: <\/p>\n
\n- Teeth adapted to tearing muscles and crunching bones<\/span><\/em><\/li>\n
- Short intestinal tract more suggestive of meat digestion than plants<\/em><\/span><\/li>\n
- Eyes sensitive to movement for catching prey<\/em><\/span><\/li>\n
- Good dim light vision<\/em><\/span><\/li>\n
- Superior sense of smell for tracking prey<\/span><\/em><\/li>\n<\/ul>\n
<\/span><\/p>\nThese evolutionary traits helped dogs survive historically, but whether they are relevant to the modern dog\u2019s lifestyle is a different question.<\/p>\n
Again, we begin to blur the lines between ethics and science.<\/strong><\/strong><\/strong><\/strong><\/em><\/p>\nProtein quality is another important consideration for pet parents wanting to feed a vegetarian diet.<\/p>\n
In many cases, the quality of proteins from plants is lower than the quality of protein from animal sources. <\/strong><\/strong><\/strong><\/strong><\/em><\/p>\nWhen feeding a vegetarian diet, it\u2019s important to ensure the diet is meeting the overall nitrogen needs and minimum requirements for amino acids.<\/p>\n
A veterinary nutritionist is best suited for ensuring the diet is adequate.<\/p>\n
Again, at this time, a well-balanced and nutritionally complete vegetarian diet appears to be safe and well-tolerated in dogs.<\/strong><\/strong><\/strong><\/strong><\/em><\/p>\n
<\/span><\/p>\nWould Dogs Enjoy a Vegetarian Diet?<\/strong><\/strong><\/h2>\nIt would be wonderful if dogs could speak to us and tell us how they feel about their food, but we can only make our best guess based on what we observe.A recent study indicated that dog guardians didn\u2019t report any difference in their pet\u2019s appetite behavior when eating a vegan diet, conventional diet, or raw meat diet.<\/strong><\/strong><\/strong><\/strong><\/em><\/p>\nOne can assume that this means a vegetarian diet rather than a vegan diet would be acceptable to dogs, as well.<\/p>\n
How To Choose A Vegetarian Diet For Your Dog<\/strong><\/strong><\/h2>\nThe National Research Council (NRC) develops nutrient recommendations for dogs and cats in the United States.<\/strong><\/strong><\/strong><\/strong><\/em><\/p>\nNRC recommendations form the basis for the Association of American Feed Control Official\u2019s (AAFCO) nutrient profiles for dogs.<\/p>\n
AAFCO develops and implements laws, regulations, and standards for these diets. <\/p>\n
If you are planning to feed your dog a commercial vegetarian diet, ensure the food you pick has a nutritional adequacy statement specifying that the food was either formulated to meet AAFCO Dog and Cat Food Nutrient Profiles or that an AAFCO feeding trial was conducted.<\/strong><\/strong><\/strong><\/strong><\/em><\/p>\nIf neither of these was completed, the food must be labeled as a snack, treat, or dietary supplement.<\/p>\n
One study found that quite a few vegetarian diets listed as meeting AAFCO requirements actually failed to meet the nutritional adequacy and labelling requirements when evaluated.<\/strong><\/strong><\/strong><\/strong><\/em><\/p>\n
<\/span><\/p>\nHowever, the three vegetarian diets labelled for sale as prescription diets from a veterinarian all met the requirements.<\/p>\n