The longest dog tail is 26 in (66.04 cm), achieved by Bentley, the Great Dane, from Colorado, USA, on 12 April 2012. Bentley is owned by Patrick Malcom (USA) and his family.
Bentley is the nephew of previous 'Tallest dog' record holder, Gibson and stands at 43.5 in (110.49 cm) tall. He is due to be used as a model dog for a publicity campaign with a major pet provider in USA.
Please note: all records were current at the time of publication, but may have been broken since.