A new study has documented reported health benefits in dogs switched from a meat-based diet to a vet formulated vegan offering. The findings have been published in a peer reviewed journal in their archives of clinical and biomedical research and represent the first  to demonstrate tangible health benefits in such a cohort of dogs. 

Notably up to 90% of dogs suffering with watery stools (9/10) were reported to have improved stool consistency after switching to the diet and almost half had notable improvement in haircoat glossiness (48/98). 77% of dogs suffering with dry skin and dandruff were also seen to have either partial or full resolution of signs (13/17)  after the switch and there were reports of reductions in anxiety and aggressive behaviour..  

Other noted benefits included improvements in:

  • redness of the skin & ears
  • itchiness
  • passing gas
  • activity levels 

This is the first-time health benefits, including those affecting behaviour, have been documented in dogs being fed a UK vegan dog food - The company named Omni, was co-founded by veterinarian, Dr. Guy Sandelowsky, inspired to create a healthier diet after seeing rising rates of cancer and obesity in his patients, including his own black Labrador who suffered from mouth cancer at the young age of 4. 

 “It’s hugely rewarding to see our hard work translate into better health outcomes for pets, this is what it's all about for us at Omni.”

Feedback from the 100 participants who completed a likert-scale type survey , clearly demonstrated several positive statistically significant observations and trends towards improvements in health after feeding the diet for 3-12 months. These findings complement a plethora of recent publications that have documented the benefits of feeding dogs a vegan diet, which included observations of up to 18 months of increased life span, fewer vet visits and reduced requirement for lifetime medications compared to dogs on conventional processed-meat diets.

Even though domestic dogs are members of the order Carnivora, they are classified as nutritional omnivores after evolving genetically. “We’ve known for some time now that dogs, like us, are omnivorous and are able to derive the nutrients they need to thrive from a variety of food sources, including plants,” Sandelowsky says. Avoiding animal products, according to these findings, seems to not only have planetary benefits but could have health advantages too. 

References 

Davies, M., 2022. Reported Health Benefits of a Vegan Dog Food: A Likert Scale-type Survey of 100 Guardians. bioRxiv, pp.2022-05.

Dodd, S., Khosa, D., Dewey, C. and Verbrugghe, A., 2022. Owner perception of health of North American dogs fed meat-or plant-based diets. Research in Veterinary Science, 149, pp.36-46

Knight A, Huang E, Rai N, Brown H. Vegan versus meat-based dog food: Guardian-reported indicators of health. PLoS One 2022; 17, e0265662.

FAQs

But aren’t dog’s carnivores?

Dogs are in fact nutritional omnivores as demonstrated by a robust scientific study published in the reputable journal Nature (1,2) in which it was shown that they have 30 copies of the AMY2B gene responsible for digesting plant-based foods.

They have also evolved relatively long intestines (21) (almost as long as humans) and relatively flat surfaces on their molars (31, 22) which they use for digesting and chewing a whole range of foods.

The common misconception that dogs are carnivores probably arises from the fact that they are classified in the order Carnivora but so are plenty of other species like bears, skunks, racoons who are omnivores and even the giant panda who thrives on a plant-based diet (20).

Is plant protein digestible to dogs?

Absolutely yes, studies which have looked at how much protein dogs can absorb from plant-based and fungi-based foods like soya and yeast demonstrated over 75% digestibility which is on par with meat-based foods (23, 24, 34, 35 & 25).

Both these protein sources also contain all 10 essential amino acids (36, 37) that dogs need to thrive.

Isn't there too much fibre in plant-based food?

The average amount of fibre in a commercial dog food diet is between 2-4%. omni’s plant-powered recipe has a fibre content of 3% which is on par with meat- based diets.

In our survey with over 200 dog owners, 100% reported that their dog’s stool consistency was either ‘normal’ or ‘perfect’ and there were no reports of any digestive upsets (data on file).

Can I mix omni with other meat-based diets?

We are proud that our recipes are nutritionally complete and so include everything your dog needs to thrive. This means omni can be fed as a sole ration. We also fully support a 'flexitarian approach' like meat free lunches or using omni as a mixer.

Every little helps to bring some of the health and environmental benefits of plant-power to meal times. Mixing omni with meat/fish will help to add variety into your dog’s diet whilst adding in healthy ingredients with a relatively low carbon footprint.

Can plant-based food provide the essential fatty acids dogs need?

All the essential fats and oils that dogs need, including omegas 3 and 6 are found in a variety of both meat and plant-based foods (31, 28).

omni’s recipe is rich in plant-based sources of these nutrients so your dog will get all the essentials they need.

I hear a lot about feeding raw meat, isn’t that better?

Feeding raw meat to dogs has become a very popular trend in recent years, but most vets will warn against this practise. This is because the cooking process is vital to help kill off dangerous bacteria like E coli, Salmonella and Campylobacter (9) that have necessitated several food recalls from the market and caused serious illness and even death in both dogs and their owners (40, 41, & 42).

There are also several worms and parasites that are only killed off when raw meat is cooked. Dogs are dogs, not wolves and thanks to their domestication over thousands of years, thankfully don’t need to hunt to get their grub nor do they need to eat raw meat, it's just not worth the risk.

References

1. Buff P.R., Carter R.A., Bauer J.E., Kersey J.N. (2014) Natural pet food: A review of natural diets and their impact on canine and feline physiology. J. Anim. Sci.;92:3781–3791. doi: 10.2527/jas.2014-7789


2. Axelsson E., Ratnakumar A., Arendt M.L., Maqbool K., Webster M.T., Perloski M., Liberg O., Arnemo J.M., Hedhammar A., Lindblad-Toh K. (2013) The genomic signature of dog domestication reveals adaptation to a starch-rich diet. Nature; 495:360–364. doi: 10.1038/nature11837


3. The European Pet Food Industry (FEDIAF) Nutrition [ Accessed on 3 June 2021] Available online: http://www.fediaf.org/self-regulation/nutrition/


4. Gentle World Good Nutrition for Healthy Vegan Dogs [Accessed on 3 June 2021] Available online: http://www.webcitation.org/6ineIZmNQ


5. Peden J. (1999) Vegetarian Cats & Dogs. 3rd ed. Harbingers of a New Age; Troy, MT, USA


6. Semp P.-G. (2014) Master’s Thesis. Veterinary University of Vienna; Vienna, Austria: Vegan Nutrition of Dogs and Cats


7. Brown W.Y., Vanselow B.A., Redman A.J., Pluske J.R. (2009) An experimental meat-free diet maintained haematological characteristics in sprint-racing sled dogs. Br. J. Nutr.;102:1318–1323. doi: 10.1017/S0007114509389254


8. People for the Ethical Treatment of Animals (PETA) Dog Health Survey. [Accessed on 3 June 2021]


9. Marks S.L., Rankin S.C., Byrne B.A., Weese J.S. (2011) Enteropathogenic bacteria in dogs and cats: Diagnosis, epidemology, treatment, and control. J. Vet. Intern. Med.;25:1195–1208. doi:


10. Carrión P.A., Thompson L.J., Motarjemi Y., Lelieveld H., (2014) Food Safety Management: A Practical Guide for the Food Industry. Academic Press; London, UK:. pp. 379–395


11. Knight, A. and Leitsberger, M. (2016) Vegetarian versus meat-based diets for companion animals. Animals 6, 57.


12. Boyer C.I., Jr., Andrews E.J., deLahunta A., Bache C.A., Gutenman W.H., Lisk D.J. (1978) Accumulation of mercury and selenium in tissues of kittens fed commercial cat food. Cornell Vet.;68:365–374.


13. Anonymous. Your Pet’s Dog Food Could Be Dangerous. [Accessed on 8 December 2014] Available online: http://www.wavy.com/Global/story.asp?S=1018127&nav=23iiCT4S.


14. Porecca K. (1995) Personal letter to James Peden re: Interview of University of California (Davis), North Carolina State University, and University of Guelph Researchers investigating the connection between dilated cardiomyopathy and diet


15. Perry T. What’s Really for Dinner? [Accessed on 7 July 2016] Available online: http://www.webcitation.org/6ipEL5YVR.


16. https://www.bordercolliefanclub.com/bramble-the-vegan-dog-lives-to-189-years/


17. https://aminoapps.com/c/vegan/page/blog/vegan-dog-lives-to-27-years-of-age/N4ai_MuaRE5qNoYVN1DN85ap0GVjz3j


18. https://v-dog.com/blogs/v-dog-blog/vegan-diets-for-dogs-what-about-longevity


19. https://www.fediaf.org/39-prepared-pet-foods/80-understanding-labels.html


20. https://vetnutrition.tufts.edu/2016/07/vegan-dogs-a-healthy-lifestyle-or-going-against-nature/

21. https://www.petmd.com/dog/nutrition/7-interesting-facts-about-your-dogs-digestive-system

22. http://www.vivo.colostate.edu/hbooks/pathphys/digestion/pregastric/dogpage.html

23. Félix AP, Zanatta CP, Brito CB, et al. (2013) Digestibility and metabolizable energy of raw soybeans manufactured with different processing treatments and fed to adult dogs and puppies. J Anim Sci;91:2794–2801.


24. Carciofi A, de-Oliviera L, Valério A, et al. (2009) Comparison of micronized whole soybeans to common protein sources in dry dog and cat diets. Anim Feed Sci Technol;151:251–260.

25. Yamka R, Kitts S, Harmon D. (2005) Evaluation of low-oligosaccharide and low-oligosaccharide low-phytate whole soya beans in canine foods. Anim Feed Sci Technol;120:79–91.

26. Hill D. (2004) Alternative proteins in companion animal nutrition, in Proceedings. Pet Food Assoc Canada Fall Conf;1–12

28. Hazewinkel HA, Tryfonidou MA. (2002) Vitamin D3 metabolism in dogs. Mol Cell Endocrinol;197:23–33.
Boland R, Skliar M, Curino A, et al. (2003) Vitamin D compounds in plants. Plant Sci;164:357–369.

29. Jäpelt RB, Jakobsen J. (2013) Vitamin D in plants: a review of occurrence, analysis, and biosynthesis. Front Plant Sci;4:136

30. Knight, A. and Leitsberger, M. (2016). Vegetarian versus meat-based diets for companion animals. Animals 6, 57.

31. Dodd SAS, Adolphe JL, Verbrugghe A. (2018) Plant-based diets for dogs. J Am Vet Med Assoc. Dec 1;253(11):1425-1432. doi: 10.2460/javma.253.11.1425. PMID: 30451617.

32. https://www.petmd.com/dog/wellness/evr_dg_how_long_do_dogs_live [Accessed 2 June 2021]

33. https://www.utep.edu/leb/pleistnm/stuff/stuff2.htm [Accessed 2 June 2021]

34. M S Martins, N K Sakomura, D F Souza, F O R Filho, M O S Gomes, R S Vasconcellos, A C Carciofi (2014) Brewer’s yeast and sugarcane yeast as protein sources for dogs, J Anim Physiol Anim Nutr (Berl) 2014 Oct;98(5):948-57. doi: 10.1111/jpn.12145.

35. Christina Golder, James L Weemhoff, Dennis E Jewell (2020) Cats Have Increased Protein Digestibility as Compared to Dogs and Improve Their Ability to Absorb Protein as Dietary Protein Intake Shifts from Animal to Plant Sources 24;10(3):541. doi: 10.3390/ani10030541.

36. Henkel J. (2000) Soy. Health claims for soy protein, questions about other components. FDA Consum ;34(3):13–15,18–20.

37. Yalçin, Sakine & Erol, H & Özsoy, Bülent & Onbaşılar, I. (2008) Effects of the usage of dried brewing yeast in the diets on the performance, egg traits and blood parameters in quails. Animal : an international journal of animal bioscience. 2. 1780-5. 10.1017/S1751731108003170.

38. Rosser EJ (1993) Diagnosis of food allergy in dogs. Journal of the American Veterinary Medical Association; 203(2):259-262.

39. Mueller RS, Olivry T, Prélaud P. (2016) Critically appraised topic on adverse food reactions of companion animals: common food allergen sources in dogs and cats. BMC Vet Res.12:9. Published 2016 Jan 12. doi:10.1186/s12917-016-0633-8

40. https://www.kentlive.news/whats-on/shopping/salmonella-fears-spark-urgent-recall-4328262

41. https://www.food.gov.uk/news-alerts/alert/fsa-prin-31-2020

42. L. Martinez-Anton, M. Marenda, S.M. Firestone, R.N. Bushell, G. Child, A.I. Hamilton, S.N. Long, M.A.R. Le Chevoir (2018) Investigation of the Role of Campylobacter Infection in Suspected Acute Polyradiculoneuritis in Dog


43. https://www.foodsafetynews.com/2018/10/four-stec-infections-one-person-dead-after-exposure-to-raw-pet-food/

44. https://www.theguardian.com/science/2018/jan/12/scientists-criticise-trend-for-raw-meat-pet-food-after-analysis-finds-pathogens

45. https://news.cancerresearchuk.org/2015/10/26/processed-meat-and-cancer-what-you-need-to-know/

46. D.F. Merlo, L. Rossi, C. Pellegrino, M. Ceppi, U. Cardellino, C. Capurro, A. Ratto, P.L. Sambucco, V. Sestito, G. Tanara, V. Bocchini (2008) Cancer Incidence in Pet Dogs: Findings of the Animal Tumor Registry of Genoa, Italy
https://doi.org/10.1111/j.1939-1676.2008.0133.x , journal of veterinary internal medicine

47. https://www.pfma.org.uk/_assets/docs/White%20Papers/PFMA-Obesity-Report-2019.pdf

48. https://www.pfma.org.uk/grain-free-factsheet

49. https://fediaf.org/images/FEDIAF_Nutritional_Guidelines_2020_20200917.pdf

50. https://www.ksvdl.org/resources/documents/dcm-forum/Confidential-Abstract-for-release-October-14-2020-Final.pdf

51. https://www.ksvdl.org/resources/documents/dcm-forum/DCM-Forum-SolomonOpening-Remarks.pdf

52. https://stpetersbark.com/finally-theres-no-evidence-linking-grain-free-diets-and-non-hereditary-heart-conditions-in-dogs/

53. Okin GS (2017) Environmental impacts of food consumption by dogs and cats. PLoS ONE 12(8): e0181301. https://doi.org/10.1371/journal.pone.0181301

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