No ShowGuinness World Records – Longest tongue on a dog by John JayPublished December 7, 2017 Related: Guinness World Records – Longest Wave Surfed by a Dog Guinness World Records – Longest fingernails ANSWER: 7.31 inches Get your copy of the Guinness World Records 2018 Here: https://www.guinnessworldrecords.biz/longesttonguedogNEW