A chihuahua mix "su-paw-star" Spike from Ohio has now claimed the Guinness World Record as the world's oldest living dog. He loves long walks, crunchy Doritos and weekend baths. Guinness World Records North America said Spike, the new record-holding pooch, stands at 9 inches tall and weighs just under 13 pounds. Spike is 23 years old. The world's oldest dog title can change hands while title holders are still living when canny humans catch wind of the Guinness World Records, get their pets verified and stake a claim to the title. TobyKeith, a pure-bred chihuahua, who is still enjoying life in Florida, has held the title several times in the past year. #dogsofinstagram #oldestdog