Average lifespan: about 16 years
The Energizer Bunnies of the dog world, these tenacious terriers “keep going and going and going”—and apparently, so do their lifespans! You could argue that all this boisterous energy is the secret to keeping Jack Russells young-at-heart well into their twilight years. They get their name from a person in England known as Jack Russell, surprisingly enough, who bred hunting dogs in the 19th century.

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