These horses aren't taking a dip in the water just to cool off in the sweltering Virginia summer. They're the famous Chincoteague ponies of Assateague Island, and they're herded across the channel to Chincoteague Island every July by "saltwater cowboys." Most of the foals are auctioned off the next day to raise money for the Chincoteague Volunteer Fire Company, which owns and manages the herd under a permit from the U.S. Fish and Wildlife Service. A few foals designated as "buybacks" are donate