Generally, smaller breeds live longer than larger breeds, but beyond that, the life span of any individual dog will vary based on genetic and environmental conditions. Some small dog breeds may be considered senior at 10-13 years, while giant breeds are classified as seniors at ages as young as five. Your veterinarian is your best source for determining when your dog reaches his senior citizenship.

I really woud like to hear from users that have pets that have lived lives longer than what the books project.  Please, please, please I would love to hear what you did to help keep them alive.

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