Lifespan / Longevity
Longevity in domestic dogs depends on the care they receive, their
breed, and
body size.
In general, larger breeds have shorter lifespans.
Many giant dog breeds average only 7 or 8 years, while some small
terrier breeds might live as long as 20 years.
The average lifespan for mixed-breed and midsize dogs is about 13 to 14
years. The longest-lived dog with reliable documentation died at 29 in
1939.
