09/04/2026
Do raw-fed dogs live longer? Is there science to prove it? The short answer to both questions is ‘yes’.
The most compelling study comes from Belgium. In 2003, researchers Lippert and Sapy, writing for the Prince Laurent Foundation (a non-profit organisation for animal welfare) followed 522 dogs over five years and set out to identify the factors that most determined lifespan. They examined breed, size, s*x, housing conditions, sterilisation status and, crucially, diet. Their conclusion was unambiguous: diet was the single most powerful external factor in determining how long a dog lives. Dogs fed a homemade, fresh food diet reached an average age of 13.1 years. Those fed on industrially processed commercial food died at an average age of 10.4 years. That is a difference of nearly three years… 32 months of additional life, simply from the quality of food in the bowl.
The researchers were careful to acknowledge that this was an observational study, meaning it could not fully account for every variable. Perhaps owners who feed fresh food are also more attentive to veterinary care in general. That is a fair caveat. But the magnitude of the difference, sustained across a large population of real household dogs over five years, is difficult to dismiss.
Supporting evidence comes from the 14-year Purina Labrador study, one of the most controlled canine feeding experiments ever conducted, published in the 'British Journal of Nutrition' (Lawler et al., 2008). Dogs kept lean – fed 25% fewer calories than their ad libitum pair-mates – lived a median of 1.8 years longer and had significantly delayed onset of chronic diseases. This matters because raw-fed dogs naturally tend to be lean: without the carbohydrate-dense fillers found in processed food, they maintain a healthier body composition. Every gram of excess fat is pro-inflammatory. Inflammation is the engine of chronic disease.
The Dog Aging Project — a large-scale longitudinal study funded by the US National Institutes of Health — has been tracking tens of thousands of companion dogs to understand what influences their health. One finding, published in 'GeroScience' in 2022, is that once-daily feeding was associated with significantly better health compared to multiple daily meals. This mirrors the natural feeding pattern of wolves and wild canids (i.e. a ‘feast or famine’ rhythm, and suggests that how often a dog eats, not just what it eats, has measurable biological consequences.
Nobody has yet conducted a large-scale, long-term controlled trial directly comparing raw-fed dogs to kibble-fed dogs over their lifetimes. The commercial pet food industry has never commissioned one for obvious reasons, and the academic sector has shown little interest in funding it. What we have is the Belgian study — observational but substantial — and a growing body of research indicating that lean body condition, fresh food and natural feeding patterns all independently support longevity.
In the meantime, the parallel with human nutrition is instructive. Health authorities worldwide tell us to eat fresh, whole, minimally processed foods and to limit ultra-processed products. There is no scientific or logical reason why this principle would not apply to our dogs.
