Morbidity and mortality in elderly dogs - a model for human aging.
Level 5 - mechanism / opinion, no new human data
Animal necropsy study with no human data
PubMed 36581919 · doi:10.1186/s12917-022-03518-8
What was done
Age-related morbidities and causes of mortality were evaluated in a population of 269 elderly dogs (130 males and 139 females) submitted for post-mortem necropsy examination.
What was found
The reproductive, cardiovascular, and urinary systems (and the mammary gland in females) had the highest number of age-related morbidities. Cardiovascular and urinary diseases were significantly more prevalent in males, while mammary lesions occurred exclusively in females. Urinary disease was more frequent in small-breed dogs, whereas peritoneal and male genital morbidities were significantly higher in larger breeds. Hyperplastic and degenerative lesions were common. Neoplasia was the leading cause of death, accounting for almost half of all deaths, with cardiovascular and urinary pathologies also serving as frequent causes of mortality. Exact percentages and p-values were not reported in the abstract.
Why it matters
The study outlines the pathology and mortality profiles of aging domestic dogs, supporting their potential relevance as a comparative model for human gerontology under the One Health framework.
Limits
This is an animal study without direct human data. The sample is restricted to dogs submitted for necropsy, introducing potential referral and selection biases. The abstract does not report specific numerical counts, percentages, effect sizes, or exact statistical metrics.