Should Dogs & Cats Go Vegan To Help The Environment?

QUEENSLAND, Australia — Can you imagine switching your pup to an all-vegan diet? It will likely take Fido some time to adjust, but it may be worth the hassle for the good of the environment. That’s the main conclusion coming from researchers at Griffith University. They estimated a variety of potential environmental benefits that could result from switching all pet dogs and cats in the United States (or the world) to nutritional, vegan diets.

It’s no secret that the livestock industry has a major impact on the environment due to all of the land and freshwater consumption and pollutant emissions it entails. However, while prior projects have focused on the impact of livestock in relation to human diets, very few studies have stopped to consider the dietary role of our pet cats and dogs. Meanwhile, other recent research indicates a nutritionally sound vegan diet (no meat, eggs, dairy) is indeed safe for dogs and cats, and may even hold “comparable healthfulness” in comparison to meat-based diets.

With all that in mind, Prof. Andrew Knight set out to calculate a series of estimates regarding the potential benefits of a hypothetical scenario in which all cats and dogs in the United States, or globally, switched over to vegan diets. To accomplish this, he made use of pet population data from 2020 for the U.S. and a 2018 dataset pertaining to worldwide estimates. The study included numerous prior studies and governmental databases as well.

Estimates show the amount of livestock consumed by dogs and cats in the U.S. is about one-fifth of that consumed by humans and about one-tenth globally. So, if all American dogs and cats suddenly started eating vegan, according to these estimates, close to two billion land-based livestock animals wouldn’t have to be slaughtered annually. That statistic jumps to seven billion if all cats and dogs around the world go vegan — and that’s not even counting the billions of aquatic animals that would also be spared.

silver tabby cat in white ceramic bowl
(Photo by Laura Chouette on Unsplash)

The study also reveals a major pet diet switch would result in significant potential reductions in land and water use, greenhouse gas emissions, use of biocides, and emissions of other pollutants. More specifically, if all dogs went vegan it could free up an area of land larger than Saudi Arabia. If all cats did the same, it would free up an area of land larger than Germany. For comparison’s sake, if all humans went vegan as well an amount of land larger than Russia and India combined could be saved. All dogs going vegan would lead to an estimated reduction of greenhouse gas emissions greater than the amount of all emissions attributed to the United Kingdom, and for cats, in Israel.

Prof. Knight adds that the pet population and animal energy requirement data used for these estimates may have underestimated the true numbers. So, the real environmental benefits of vegan diets may be even better. Still, the researcher also cautions that the calculations required certain assumptions. Ultimately, more research is warranted to reinforce these findings.

For example, the analysis applied U.S. data on numerous diet ingredients to the global calculations, as opposed to accounting for national differences across ingredients. Data from 2009 through 2011 was also used to estimate environmental impacts, which means more recent data may have resulted in different estimates. Instead of averaging across ingredients, future studies could incorporate data pertaining to the actual energy density of different animal-sourced ingredients.

“This study shows environmental benefits when vegan diets are used to feed not just people, but dogs and cats as well. However, to safeguard health, it’s important that people feed only vegan pet food labeled as nutritionally complete, produced by reputable companies with good standards,” researchers write in a media release.

The study is published in the journal PLoS ONE.

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John Anderer

Born blue in the face, John has been writing professionally for over a decade and covering the latest scientific research for StudyFinds since 2019. His work has been featured by Business Insider, Eat This Not That!, MSN, Ladders, and Yahoo!

Studies and abstracts can be confusing and awkwardly worded. He prides himself on making such content easy to read, understand, and apply to one’s everyday life.

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  1. How is that going to help the environment no dog or cat is not made for that and human race needs to leave wild life alone haven’t you did enough already let mother nature take it’s course

  2. Hi,

    Thank you for covering this story! As a vegan dog companion parent myself, I’d like to confirm the benefits, and hope more animal lovers will open their minds and hearts to consider a vegan lifestyle for their dogs or cats:

    1. Going vegan is good for us and our furry companions. The environmental benefit is indisputable; ice caps are melting fast and we need all hands/paws aboard to avoid a point of no return.

    2. There’s a health incentive too- Animal by-products in pet foods can be from diseased animals, since those can’t be sold for human consumption. That means animal-based pet foods will increase the likelihood of your pet getting cancer and other illnesses. If you want your dogs or cats to live longer, feed them a vegan diet. Vegan pet kibbles, treats and canned foods are high quality, nutritionally balanced and tasty. My dogs will chew vegan sweet potato sticks any time and gobble up their kibbles defensively.

    3. Please check out these youtube videos from Professor Andrew Knight for detailed statistics behind why vegan is the best for animal companions:
    Could Vegan Pet Food Help The Planet:
    Are Vegan Diets Good For Cats:

    Thank you and sincerely with all my love for your furry companions,

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