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Vegan Dog Diet - The Science Behind It

06 December, 2019

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A common concern about plant-based food for dogs is whether it is “natural”. If dogs evolved from wolves, and wolves preyed on other animals, shouldn't dogs also eat flesh? The following sections discuss this in depth from the evolutionary perspective (dogs evolving as human companions and living on scraps), as well as from conventional diet perspective (conventional meat-based commercial diets being very different from what wolves have consumed in the wild).

Genetic Adaptation to Plant-Based Diet

Domestic dog (Canis lupus familiaris, Canis familiaris) belong to the order of Carnivora. Their ancestral counterparts (see image below) subsisted primarily or entirely on captured prey animals. Accordingly, they have a range of evolutionary adaptations designed to facilitate capture, apprehension, mastication, digestion and absorption of animal tissues. These include senses designed to detect prey animals, a musculoskeletal system designed to facilitate their capture, canine teeth to assist with apprehension, tooth crowns designed for cutting and slicing (rather than grinding of plant materials—which are more prominent in herbivores), and intestinal tracts that are shorter and have different digestive enzymes and intestinal flora than those of herbivores, which require relatively prolonged processing and digestion times.

However, perhaps as long as 33,000 years ago, dogs were domesticated from wolves (8, 9). These ancestral dogs were partially dependent on human food scraps. Accordingly, behavioral and physiological adaptations to a more varied diet—including plant-based foods—were necessary to allow ancestral dogs to thrive and achieve evolutionary success. Compared to carnivorous wolves, omnivorous dogs have evolved a superior ability to metabolize carbohydrates, and to subsist on a diet lower in protein (10). Biochemical adaptations facilitating this include increased gene expression for pancreatic amylase, the ability to convert maltose to glucose, and increased intestinal glucose uptake (3). Accordingly, the domestic dog is biologically omnivorous ^{(2, 3)}.

Genetic and biological mechanisms shaped domestic dogs as we know them today, markedly different from the wolves they descended from. Dogs adapted to live with us, and it is natural for them to consume a diet that resembles ours, rich in grains and plants.

Conventional Meat-Based Diets Are NOT What Wolves Eat

We will now compare the ingredients included within commercial meat-based diets with the natural diets of wolves.

Commercial diets commonly include body parts from cows, sheep, pigs, turkeys, ducks, chickens, fish and prawns; some of which have been labelled as unfit for human consumption.

Conventional meat-based commercial can contain significant hazards, and a range of clearly unnatural ingredients. As described previously, these have included potentially pathogenic microorganisms, prion proteins, mycotoxins, antibiotic and hormonal residues, chemical contaminants such as melamine, plastic ear tags, styrofoam packaging, and heavy metal and organic pollutants within fish.

To encourage domesticated dogs to eat such diets, dry food may be sprayed with a combination of refined animal fat, lard, used restaurant grease, and other oils that are sometimes considered too rancid or inedible for human consumption. These provide the distinctive smell that wafts from a newly-opened packet of kibble. However, deep frying of restaurant food results in rapid oxidation, producing free radicals, trans fatty acids, and other toxins. Repeated use of oil results in the build-up of such contaminants.

Digest may also be utilised. Digest is an industry euphemism for a soup of partially-dissolved intestines, livers, lungs and miscellaneous viscera of chickens (primarily) and other animals, produced using various enzymes and acids. The precise ingredients used are trade secrets, which, in differing combinations, produce varying flavours. Batches considered to taste more like beef can transform a can of miscellaneous body parts into “Beef Stew”, while those considered more “fishy” may result in “Ocean Whitefish” and so on. According to Lewis and colleagues in Small Animal Clinical Nutrition, “Digest is probably the most important factor discovered in recent years for enhancing the palatability of dry food for cats and, to a lesser degree, dogs”.

In contrast, the natural diet of wolves consists primarily of animal protein typically sourced from larger prey, such as elk, with the nutrient-dense organs consumed first, followed by muscle tissue.

When wolves kill prey, they gorge as much as possible to prevent consumption by competitors. This is followed by uncertain periods of hunger. In stark contrast, domesticated cats and dogs are fed assorted body parts, usually from animals they would never naturally eat, dispensed from tins or packets at predictable times daily, with kibble sometimes available ad libitum (i.e. always). This bears little resemblance to natural feeding behaviour.

Clearly, there are significant differences between the prey species these animals would naturally consume, and the species routinely included within commercial meat-based diets.

"The Natural Diet"

How natural is the lifestyle that we offer to domestic dogs? In addition to offering kibble, companion animal guardians frequently microchip, vaccinate, de-worm, de-flea and de-sex their animal companions, and confine them indoors at night because they correctly believe such steps are recommended to safeguard health.

Dog guardians are willing to depart quite radically from “naturalness” when they believe it may protect the health and welfare of their pets. Accordingly, the resistance of such owners to the concept of vegetarian companion animal diets is more likely to stem from ignorance about the hazardous ingredients found within commercial meat-based diets, and about the potential of nutritionally-sound vegetarian diets to safeguard health, than from any deep-seated commitment to “naturalness”.

Given the realities of the everyday life, 'natural' becomes a subjective term. We have to look at the whole picture and re-evaluate our idea of 'natural, best solution' given the current circumstances. There is a solution that makes it possible to feed our dogs a healthy diet without harmful, cancer-causing additives and without harming other animals and the planet. It's our responsibility to choose this solution.

Nutrients over Ingredients

Dogs—and indeed all species—require specific nutrients, rather than specific ingredients. There is no reason why diets comprised entirely of plants, minerals, and synthetically-based ingredients (i.e., vegan diets) cannot meet the necessary palatability, bioavailability, and nutritional requirements of dogs⁽⁴⁾.

Evolution Diet products for dogs contain all the nutrients your dog requires. These 100% plant-based products are manufactured in the USA without the use of harmful chemicals. Established by a scientist and a researcher Eric Weisman, Evolution Diet is proud to offer nutritionally complete, vegan products that conform to AAFCO requirements for dogs of all life stages (growing, adult and senior). Transitioning your dog to a healthy, ethical plant-based diet has never been easier! Read more about us, and check out our products!

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Research Studies

Study by Semp (2014)⁽⁵⁾ – no significant differences were evident in any of the tested parameters, compared to the dogs fed a conventional diet. Lower levels of iron and vitamin B12 in vegan dogs were not observed.

Study by Brown et al. (2009)⁽⁶⁾ – It is difficult to envision any companion animals placed under greater physical demands than sprint-racing Siberian Huskies. During sprint races, these dogs run fast through snow, while hauling sleds, for much of the 30-mile race duration; half of the dogs were fed with plant-based diets, while the other half with meat-based diets. All dogs were assessed as being in excellent physical condition.

Study by PETA (1994)⁽⁷⁾ – over 80% of dogs maintained on vegan or vegetarian diets for 50% to 100% of their lifetimes were reported as being in good to excellent health (the remaining 20% of dogs had the same health problems as those commonly reported within the normal domesticated dog population).

References

(1) Buff, P.R.; Carter, R.A.; Bauer, J.E.; Kersey, J.N. Natural pet food: A review of natural diets and their impact on canine and feline physiology. J. Anim. Sci. 2014, 92, 3781–3791. [Google Scholar] [CrossRef] [PubMed]

(2) Semp, P.-G. Vegan Nutrition of Dogs and Cats. Master’s Thesis, Veterinary University of Vienna, Vienna, Austria, 2014. [Google Scholar]

(3) Axelsson, E.; Ratnakumar, A.; Arendt, M.L.; Maqbool, K.; Webster, M.T.; Perloski, M.; Liberg, O.; Arnemo, J.M.; Hedhammar, A.; Lindblad-Toh, K. The genomic signature of dog domestication reveals adaptation to a starch-rich diet. Nature 2013, 495, 360–364. [Google Scholar] [CrossRef] [PubMed]

(4) Knight, A.; Leitsberger, M. Vegetarian versus Meat-Based Diets for Companion Animals. Animals 2016, 6, 57. [MDPI]

(5) Semp, P.-G. Vegan Nutrition of Dogs and Cats. Master’s Thesis, Veterinary University of Vienna, Vienna, Austria, 2014. [Google Scholar]

(6) Brown, W.Y.; Vanselow, B.A.; Redman, A.J.; Pluske, J.R. An experimental meat-free diet maintained haematological characteristics in sprint-racing sled dogs. Br. J. Nutr. 2009, 102, 1318–1323. [Google Scholar] [CrossRef] [PubMed]

(7) People for the Ethical Treatement of Animals (PETA). Dog Health Survey. Available online: http://www.pkdiet.com/pdf/diet/Dog_Health_Survey.pdf (accessed on 17 March 2017).

(8) Ovodov, N.D.; Crockford, S.J.; Kuzmin, Y.V.; Higham, T.F.; Hodgins, G.W.; van der Plicht, J. A 33,000-year-old incipient dog from the Altai mountains of Siberia: Evidence of the earliest domestication disrupted by the last glacial maximum. PLoS ONE 2011, 6, e22821. [Google Scholar] [CrossRef] [PubMed]

(9) Skoglund, P.; Ersmark, E.; Palkopoulou, E.; Dalén, L. Ancient wolf genome reveals an early divergence of domestic dog ancestors and admixture into high-latitude breeds. Curr. Biol. 2015, 25, 1515–1519. [Google Scholar] [CrossRef] [PubMed]

(10) Buff, P.R.; Carter, R.A.; Bauer, J.E.; Kersey, J.N. Natural pet food: A review of natural diets and their impact on canine and feline physiology. J. Anim. Sci. 2014, 92, 3781–3791. [Google Scholar] [CrossRef] [PubMed]

Notice: E. Weisman, CAHP, multiple international prize-winning scientist, empiricist, former graduate human physician pioneered and provides Nutrient Compound Applications for Internal Disease (cancers, infectious disease & organ failures) in Non-Humans & Humans including Dogs, Cats, Ferrets, Rabbits, Horses, Reptiles, others & Humans. E. Weisman developed and uses nutrient compounds made up of nutrients, botanicals, vitamins, protein isolates, fruit-seed extracts, minerals and does not use pharmaceuticals for the most part. E. Weisman is an empiricist – scientist and state authorized health care practitioner that does not run a medically qualified veterinary practice depending on chemical drugs or surgery for the most part. He has reviewed much research literature, conducted 100’s of experiments & worked in 1000’s of Cat-Dog, other Non-Human & Human Cases for over 25 Years. He has also spent thousands of hours caring for, treating and training 100’s of rescued pets he has looked after over the past 28 years. As mentioned, E. Weisman provides nutrient compound applications for Human Disease. E. Weisman has available sworn statements from satisfied clients that document the efficiency of the nutrient compounds he has developed for cancers and other diseases for both Non-Human and Human subjects. He is both authorized & registered with the Minnesota Dept. of Health. Cancers are leading causes of death in Humans, Dogs and Cats. Why is this? Call Evolution Diet Health Sciences for a free assessment & consultation at 651-228-0632

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