Lifespan
Heavier dogs such as the Greater Swiss Mountain Dogs tend to have shorter lifespans than medium- and small-sized dogs; longevity is inversely related to breed size. Two websites list the life expectancy for Greater Swiss Mountain Dogs at 10 to 11 years; another lists it as 8–10 years. A survey by the US breed club shows a median lifespan of 6.75 years. Dog lifespans may vary in different countries, even in the same breed.
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