LONDON (Reuters) - Barney the guard dog went berserk at a teddy bear exhibition in England and ripped the stuffing out of Elvis Presley's beloved bear Mabel, exhibitors said on Thursday.Wookey Hole Caves, a popular holiday destination in Somerset, southern England, was drawing children with its display of 1,000 precious teddy bears, including Mabel, beloved bear of the King of Rock and Roll.But, said General Manager Daniel Medley, it all went horribly wrong.The collection was so valuable that the insurance company insisted the exhibitors guard it with dogs. Barney, a sleek and handsome Dobermann, was dutifully dispatched."The security guard was doing his normal patrols at the site. He let the dog in, and the dog went on a rampage," Medley told Reuters."He started with Mabel, took a very large chunk out of Mabel almost severing her head, and then went mad. It took about 20 minutes to bring him out."Dozens of other bears were shredded too