Twenty-five years after the start of the Purina Life Span Study, its findings continue to inform veterinary understanding of the relationship between body condition, nutrition, longevity, and age-related disease in dogs.

The 14-year study followed 48 Labrador retrievers from seven litters, comparing matched littermates fed the same complete and balanced diets. Within each pair, one dog received approximately 25 per cent less food to help maintain lean body condition, while the other served as a control.

The results showed a difference in both lifespan and the timing of age-related health problems. Dogs maintained in lean body condition lived a median of 13.0 years, compared with 11.2 years for control-fed dogs — a difference of 1.8 years, or approximately 15 per cent.

Lean-fed dogs also reached a median age of 12.0 years before treatment was required for age-related chronic conditions, compared with 9.9 years among control-fed dogs.

Joint health outcomes differed between the groups, as well. At eight years of age, 10 per cent of lean-fed dogs had osteoarthritis affecting two or three joints — the hip, shoulder, elbow, or stifle — compared with 77 per cent of control-fed dogs.

Research continues beyond the original findings

The study’s contribution extends beyond its initial results. Purina says researchers have continued to use its longitudinal data and biological samples to investigate canine aging. This includes the development and validation of a biological clock and clinical markers that may help estimate biological age, assess health trajectories, and predict mortality risk.

These tools could support further research into why dogs of the same chronological age experience different health outcomes and how factors such as nutrition and body condition may influence aging.

“The Purina Life Span Study reflects our commitment to high-quality, long-term research,” says Brittany Vester Boler, PhD, of Nestlé Purina PetCare Global Research & Development. “Its data and samples are still helping us ask — and answer — new questions about healthy aging in dogs.”