In his critically acclaimed book “Dr. Pitcairn’s Complete Guide to Natural Health for Dogs and Cats”, Dr. Richard Pitcairn decided to promote plant-based diets after discovering first-hand the improvements in dogs’ conditions that stemmed from their transition away from meat-based diets.

Will a vegan diet help my dog live longer?
So what about lifespan? Of course, once we’ve built that unbreakable bond, we want our furry friends to remain with us – happy and healthy – for as many years as possible. This means that we strive to do all we can to ensure our dogs live well beyond their life expectancy. Naturally, some of it comes down to luck, but nutrition can play a vital part. And there are now reasons to believe that plant-based diets can make all the difference.
In fact, according to the Guinness Book of World Records, one of the longest-living dogs of all time, Bramble the Collie, was a fully-fledged vegan. Bramble actually lived to 25 – which was almost double the life expectancy of a Collie – and in case you thought this was a case of correlation rather than causation, five of Bramble’s vegan “siblings” also lived to beyond 19. The key differentiating factor in all cases? Their diet.
Does feeding my dog a vegan diet reduce the risk of obesity?
As well as an increased risk of disease and a shorter life expectancy, meat-based diets have also been strongly linked to obesity among pets. This has been recognised by a number of scientific studies, with vets now publicly acknowledging the issues posed by rising obesity levels among the canine population. To that end, it’s now estimated that one in three dogs in the United States is overweight or obese, and it’s likely that the statistics in the UK aren’t far off.

So why does this matter? Well, obesity has been linked to more than 20 disease conditions, including arthritis, diabetes, kidney disease, heart disease and cancer. Obesity is also linked to shorter lifespans, with one sobering study of Labrador Retrievers finding that the life expectancy of even moderately overweight dogs can reduce by nearly two years.
Exercise plays a role of course, but when it comes to weight-management, nutrition is fundamental. It has even been shown that transitioning overweight dogs to a complete and balanced plant-based diet can often reverse the ill effects of meat consumption, enabling weight loss and improved weight maintenance, as well as improved mobility and energy levels.
How can this be the case? Well, fruits and vegetables provide highly-nutritious options, with far fewer calories than your traditional meat-based dishes. This might be why leading vet Dr. Lorelei Wakefield says she has yet to see an obese vegan dog! Moreover, a recent study published by the Physicians Committee for Responsible Medicine has found that plant-based diets can improve insulin sensitivity and beta-cell function in overweight adults.
Can a vegan diet improve or prevent allergies and inflammatory conditions in dogs?
Some dogs also suffer from a variety of allergies, food sensitivities, and other inflammatory conditions, which can lead to diarrhoea, vomiting, digestive issues such as IBS, rashes and itchy skin, yeast infections, joint pain, arthritis, and a whole host of other unpleasant symptoms. And once again, it appears that meat-based pet food could have been been a significant contributor.