2. Chihuahua

Maximum Life Span: 20 Years

Average Life Span: 17 Years

Best known for its star performance as the Taco Bell mascot, the chihuahua is the smallest dog breed and hence one of the longest lasting. These dogs were named after a state in the country of Mexico. You can have either a smooth or long coat chihuahua, which is just a variation of the dog breed.

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