High Quality Content by WIKIPEDIA articles! The Fredericksburg Dog Mart is an annual dog show and fair held in Fredericksburg, Virginia. The event first took place in 1698 to facilitate trading between the Manahoac Tribe of King William County, Virginia and settlers in and around the area that would become the city of Fredericksburg. At the Dog Mart, the Manahoac (and, later, their descendants, the Pamunkey and the Mattaponi) would trade furs and produce for prized English hunting dogs. Though it has not been held continuously since that year, it is the oldest event of its kind in the United States.