
Dogs have traditionally been thought of as carnivores, but they are actually omnivores, and several studies have shown that a vegetarian or vegan diet could be beneficial for their health and even extend their lifespan. While there is some controversy around the health implications of vegetarian diets for dogs, and some concerns about whether dogs will accept these diets, there is a growing body of evidence to suggest that plant-based diets can be just as nutritious for dogs as meat-based diets, and that they may even live longer as a result.
| Characteristics | Values |
|---|---|
| Dogs living longer on a vegetarian diet | Yes, according to some studies. |
| Number of studies | Growing rapidly |
| Sample size of studies | Small |
| Health impact | Positive, fewer health issues, less frequent vet visits, improved health outcomes, improved vision, improved liver conditions, improved digestive health, improved skin health, fewer hormone disorders, improved longevity |
| Dog acceptance | Taste tests show dogs eat plant-based food |
| Commercial need | Three times as many vegetarian pet foods launched in the UK in 2014 compared to the previous three years |
| Owner interest | One in three owners may consider switching to a vegan diet for their pet |
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What You'll Learn
- Dogs are omnivores, so they can get all the amino acids they need from a vegetarian diet
- A plant-based diet can reduce a dog's carbon footprint and animal farming impact
- Studies show dogs on vegetarian diets need fewer vet visits and have fewer health issues
- Dogs on vegetarian diets can get enough protein from plant-based sources
- A vegetarian diet can improve a dog's health and lifespan by up to 18 months

Dogs are omnivores, so they can get all the amino acids they need from a vegetarian diet
Dogs are often thought of as carnivores, but they are actually omnivores, and can therefore get all the amino acids they need from a vegetarian diet. The canine body has the ability to transform certain amino acids, the building blocks of protein, into others, meaning that dogs can get all the amino acids they need while avoiding meat.
Eggs, for example, have the highest biological value of all the protein sources commonly used in pet foods. The biological value of a protein measures its ability to supply the individual amino acids that an animal needs. A well-rounded diet for dogs can include plant-based sources of protein, such as beans, corn, soy, and whole grains.
There is a growing number of studies examining plant-based dog food, and several studies have endorsed vegan dog food. Semp (2014) and Keimer (2019) noted that vegan dog food improved health outcomes for dogs as opposed to conventional diets. Brown et al. (2009) conducted a study on sprint-racing Siberian huskies and concluded that the dogs were just as healthy as meat-eating dogs.
A study by Dr. Andrew Knight, Professor of Animal Welfare and Ethics, and Founding Director of the University of Winchester Centre for Animal Welfare, showed that a vegan diet could maintain or even improve a dog's health. Vegan dogs needed to visit the vet less frequently and suffered from fewer health issues than those consuming meat. Dr. Knight concluded that “the healthiest and least hazardous dietary choices for dogs are nutritionally sound vegan diets.”
In addition, a recent peer-reviewed, survey-based study that monitored thousands of dogs eating various diets found that those on vegan diets lived up to 18 months longer than those eating conventional meat-based diets. Researchers from the University of Guelph collected and analysed data from over 1,400 dog guardians across Canada and the US for the study, which found that dogs on plant-based diets had a mean lifespan of 14.1 years, compared to a mean of 12.6 years for those on meat-based diets.
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A plant-based diet can reduce a dog's carbon footprint and animal farming impact
Dogs have a higher carbon footprint than cats, and a large dog's carbon footprint can be up to twice as high as the average annual carbon emissions of a family car, especially if the dog's diet is beef-intensive. The majority of their carbon footprint is generated from their diet, and meat-eating by dogs creates the equivalent of about 64 million tons of carbon dioxide a year. This has a significant environmental impact, and if a country were made up of just cats and dogs, it would rank fifth in the world for meat consumption.
The production and processing of meat for food represent one of the biggest contributors to greenhouse emissions in the western world. A plant-based diet can help reduce a dog's carbon footprint as it does not require the same level of energy input, material, and water resources as meat production. Additionally, investments in low-resource crops such as legumes promote water conservation and preserve farmland, as they occupy minimal arable land.
The pet food industry has a huge impact on the environment, with 300 million pounds of non-recyclable pet food and treat bags being manufactured in the US alone each year. By choosing a plant-based diet for their dogs, owners can reduce the environmental impact of the pet food industry and support more sustainable practices.
While there is some debate about the health benefits of a vegan diet for dogs, some studies have shown that dogs on plant-based diets have improved health and live longer than those on meat-based diets. It is important to ensure that dogs receive all the necessary nutrients, vitamins, and minerals, regardless of whether they are sourced from plant-based or meat-based ingredients.
Overall, a plant-based diet for dogs can be a more sustainable and environmentally friendly option, helping to reduce their carbon footprint and the impact of animal farming.
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Studies show dogs on vegetarian diets need fewer vet visits and have fewer health issues
Dogs have traditionally been considered carnivores due to their evolutionary link with wolves. However, modern dogs are domesticated and have evolved to be able to consume a more diverse diet. According to a 2013 study, dogs today are genetically different from their wolf ancestors, and their digestive systems can effectively process carbohydrates and plant starches.
Several studies have indicated that dogs on vegetarian diets need fewer vet visits and experience fewer health issues. Dr. Andrew Knight, Professor of Animal Welfare and Ethics and Founding Director of the University of Winchester Centre for Animal Welfare, conducted a study that compared the health of dogs fed plant-based diets to those consuming meat. The research found that vegan dogs had improved health, including fewer issues with vision, digestion, and liver conditions. Additionally, they required less frequent veterinary care. Dr. Knight concluded that "the healthiest and least hazardous dietary choices for dogs are nutritionally sound vegan diets."
The number of studies examining plant-based diets for dogs is increasing, and most of them endorse vegetarian or vegan dog food. Semp (2014) and Keimer (2019) reported improved health outcomes for dogs on vegetarian diets compared to conventional diets. Brown et al. (2009) studied sprint-racing Siberian huskies and found no significant difference in health between dogs on vegetarian and meat-based diets. Only one study, by Yamada et al. (1987), suggested that vegetarian diets could be less beneficial, but it had a very small sample size.
In addition to improved health, vegetarian diets have been linked to longer lifespans in dogs. Researchers from the University of Guelph analyzed data from over 1,400 dog owners and found that dogs on plant-based diets had a mean lifespan of 14.1 years, compared to 12.6 years for those on meat-based diets. Another study by Dodd et al. (2019) surveyed 1,189 dog owners, including 357 who had fed their dogs vegan food exclusively for at least three years. They found that vegan dogs lived up to 18 months longer than non-vegan dogs.
While some concerns have been raised about the potential adverse effects of vegetarian diets on dogs, the evidence suggests that these diets can be safe and beneficial when properly balanced. Dogs can obtain all the necessary amino acids from plant-based sources, and eggs are an excellent source of protein for vegetarian dogs. Overall, studies indicate that dogs can thrive on vegetarian diets, experiencing improved health and potentially longer lifespans.
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Dogs on vegetarian diets can get enough protein from plant-based sources
Dogs are omnivores, and their bodies can transform certain amino acids, the building blocks of protein, into others. This means that dogs can get all the essential amino acids they need from plant-based sources.
Eggs are an excellent source of protein for dogs, and they are more biologically valuable than other protein sources commonly used in pet foods. Other sources of plant-based protein include beans, corn, soy, and whole grains. These plant-based sources can provide the amino acids needed to keep a dog's muscles, coat, and other parts of their body healthy.
However, animal proteins are generally higher-quality proteins, as they are ''complete'' proteins that contain the right ratios of all amino acids. Meat is the most important protein source for dogs and should be abundant in their diet. Chicken, for example, is among the best protein sources for dogs as it is low in fat and high in all essential amino acids. Animal proteins also contain isoleucine, valine, leucine, and lysine, which offer several health benefits for dogs.
While plant proteins tend to contain smaller amounts of essential amino acids and are less bioavailable, they still provide health benefits for dogs. For instance, they have been proven to improve cardiovascular health. Additionally, dogs with sensitivities and allergies to meat protein can benefit from plant-based proteins.
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A vegetarian diet can improve a dog's health and lifespan by up to 18 months
While dogs were once thought to be carnivores, modern dogs are domesticated and have coevolved with humans to be able to handle a more well-rounded diet. Dogs are actually omnivores, and their bodies can transform certain amino acids, allowing them to get all the amino acids they need while avoiding meat.
Several studies have found that vegan diets can improve a dog's health and lifespan. Semp (2014) and Keimer (2019) noted that vegan diets improved health outcomes for dogs compared to conventional diets. Brown et al. (2009) studied sprint-racing Siberian huskies and found that the dogs were just as healthy as meat-eating dogs. Dr. Andrew Knight, Professor of Animal Welfare and Ethics and Founding Director of the University of Winchester Centre for Animal Welfare, concluded that "the healthiest and least hazardous dietary choices for dogs are nutritionally sound vegan diets." A 2022 study by Knight et al. of 2,536 dogs found that vegan dogs had better health, including fewer issues with vision, digestion, and liver conditions. The study also found that vegan dogs lived 1.5 years longer than non-vegan dogs, with a mean lifespan of 14.1 years compared to 12.6 years for dogs on meat-based diets. Another study by Dodd et al. (2022) of 1,189 dog owners found similar results, with vegan dogs living up to 18 months longer.
In addition to improved health and lifespan, vegan diets for dogs can also reduce their carbon footprint and contribute to more sustainable food practices. It is important to note that a gradual transition over two weeks is recommended when switching a dog to a vegan diet to avoid digestive issues. While some owners may be hesitant to make the change, the evidence suggests that vegan diets can be a healthy and viable option for dogs.
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Frequently asked questions
Yes, according to several studies, dogs on vegetarian diets tend to live longer than those on meat-based diets.
One study by Dr. Andrew Knight, Professor of Animal Welfare and Ethics, and Founding Director of the University of Winchester, found that dogs on vegan diets had better health, including fewer issues with vision, digestion, and liver conditions. The study concluded that vegan diets were the healthiest and least hazardous for dogs. Another study by researchers from the University of Guelph found that dogs on plant-based diets had a mean lifespan of 14.1 years, compared to 12.6 years for those on meat-based diets.
Vets have been recommending novel protein diets for allergy-prone pets for generations with great results. Dr. Sarah Dodd, a board-certified veterinary nutritionist and vet, has also concluded through her studies that dogs on nutritionally complete vegan diets could live up to 18 months longer than dogs on meat-based diets.
Vegetarian diets for dogs have been found to reduce their carbon footprint and animal farming impact. Additionally, plant-based diets contain antioxidants that protect the cells in the body and can lead to healthier and softer fur.
It is important to ensure that dogs still receive all the necessary vitamins, minerals, and essential amino acids in their diet, regardless of whether the source is plant-based or meat-based. When transitioning to a vegetarian diet, it should be done gradually over a couple of weeks to avoid digestive issues.







































