Ranking number 2 on the list, the German Shepherd recorded the second-loudest bark officially measured. The ranking is courtesy of a German Shepherd named Daz in 2009. His 108 decibels are about as loud as a power saw. German Shepherds have long been bred to be loyal protector, ready to defend their people anytime, anyplace. For this reason, German Shepherds make great police and military dogs. They are also great service dogs for people who are visually impaired, with an ability to quickly warn their owners when danger is around.