No ShowGuinness World Records – Longest fingernails by John JayPublished December 7, 2017 ANSWER: 18 feet 10.9 inches Related: Guinness World Records – Longest tongue on a dog Guinness World Records – Longest Wave Surfed by a Dog Get your copy of the Guinness World Records 2018 Here: https://www.guinnessworldrecords.biz/longestfingernails