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A dog named Bobi from Portugal was claimed to be the oldest dog ever at 30 years old in February 2023. However, Guinness World Records later cast doubt on this claim after further investigation Smithsonian Magazine: [invalid URL removed].
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The longest-lived verified dog was an Australian cattle dog named Bluey who lived 29 years and 5 months.
So, depending on what you consider verified, the oldest dog was either Bobi at 30 years old or Bluey at 29 years and 5 months