Why little dogs outlive big dogs
Big dogs apparently die younger mainly because they age more quickly, researchers and NBC news say.
Normally, across species, larger mammals live longer. For instance, elephants can get up to 70 years old in the wild, while house mice reach only 4 years. But within species, the opposite seems true — in mice, horses and perhaps even humans.

This undated handout photo provided by the journal Science shows Gibson, a Great Dane, right, and Zoie, a Chihuahua in Grass Valley, Calif. (AP Photo/Science, Deanne Fitzmaurice)
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