The Mail on Sunday (so it must be true) reported that a similar brand exists and could have sued for trade mark infringement for infringing its trade mark without its consent. Do your searches team!
http://www.dailymail.co.uk/news/article-2845710/Apprentice-collared-Big-Dawg-blunder-BBC-left-red-faced-dreaming-new-energy-drink-exists.html