Small Dogs Tend to Live Longer Than Big Dogs. Scientists Say They Might Finally Know Why—and It Goes to the Molecular Level
Larger breeds like Great Danes seem to accumulate changes to chemical tags on their DNA more quickly than tinier breeds, such as chihuahuas. These alterations allow potentially harmful 'jumping genes' to move around their genomes
We haven't written up this one. Smithsonian has the full story — the link below goes straight to it.