Dogs and humans age through strikingly parallel machinery: conserved methylation sites ticking on the same chemistry, similar cancer, cognitive, and joint-degeneration pathways, and shared responses to leanness and exercise. Dogs are, scientifically, accelerated human-aging models that share our homes.
Where the parallels run deepest
- Epigenetics: cross-species clock mapping works quantitatively.
- Cognition: canine cognitive dysfunction mirrors early dementia patterns and enrichments.
- Metabolism: obesity shortens healthy life in both species by overlapping mechanisms.
Where they diverge
Timescale above all: a 2-year dog study covers ground needing decades in humans, which is exactly why longevity researchers prize dogs. Breed diversity also has no human parallel — no human population varies tenfold in size. Compare timelines yourself with the dog age calculator.
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