# Big Dogs Age Faster at the DNA Level, Which May Explain Their Shorter Lives

_Evidence Level: Preliminary · Mariner BL et al., Science (New York, N.Y.), DOI 10.1126/science.aeb2986_

*Epigenetic aging and transposon dysregulation reflect size-related lifespan compression in dogs.*

- **Evidence Level**: Preliminary
- **Why this grade**: Epigenetic study of 1,640 DNA samples from 894 dogs, though it shows links rather than cause and involves animals only.
- **Population**: Animal study
- **Publication Types**: Journal Article
- **Journal**: Science (New York, N.Y.)
- **Sample Size**: 894 dogs of various sizes and ages
- **Authors**: Mariner BL, McCoy BM, Greenier A, Brassington L, Slikas E, Adjangba C, Cheng C, Marye A, Harrison BR, Bamberger T, Algavi Y, Muller E, Harris A, Rout E, Reichel C, Sohrab V, Karlsson E, Akey JM, Avery AC, Borenstein E, Promislow DEL, Snyder-Mackler N, Akey JM, Anderson RM, Borenstein E, Castelhano MG, Coleman AE, Creevy KE, Dunbar MD, Fajt VR, Hoffman JM, Jonlin EC, Kaeberlein M, Karlsson EK, Kerr KF, Ma J, MacLean EL, McGrath S, Olby NJ, Promislow DEL, Reed MJ, Ruple A, Schwartz SM, Shrager S, Snyder-Mackler N, Tolbert MK
- **Graded and published**: 2026-10-08
- **Last edited**: 2026-10-09
- **Topics**: Epigenetic Clocks, Aging Biology
- **DOI**: https://doi.org/10.1126/science.aeb2986
- **Original Source**: https://pubmed.ncbi.nlm.nih.gov/42848887/

## Summary

Big dogs and male dogs age faster at the DNA level, which matches their shorter lives. Using DNA samples from 894 dogs, researchers built an aging clock that predicted which dogs died sooner. Many changes mirrored human aging genes, and size-linked shifts clustered in jumping genes (DNA bits that copy themselves around the genome). These are links, not proof that the DNA changes cause shorter lives, and nothing here was tested in people.

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_Canonical: https://longevity-germany.com/en/research/big-dogs-age-faster-at-the-dna-level-which-may-explain-their-shorter-lives · Part of Longevity Cities · Updated 2026-10-09_