Nation The world’s oldest living dog, a chihuahua named TobyKeith, breaks Guinness World record April 20, 2022April 20, 2022Asha C. Gilbert, USA TODAYComments Off on The world’s oldest living dog, a chihuahua named TobyKeith, breaks Guinness World record A Florida chihuahua named TobyKeith is the world's oldest living dog at more than 21 years old, Guinness World Records has confirmed.