What started as a bit of a recreational adventure back in June turned into a national championship earlier this month for Johnson Lane resident Heather Paterson-Lewis and her dog, Oreo.Oreo, a Blue Heeler-Australian Shepherd mix, won the Splash Dogs Dock Jumping Pro Division championship in Folsom, Calif., earlier this month with a broad jump of 22 feet, 6 inches."A friend and I were watching the news and they were showing the dock jumping with the Reno River Festival," Paterson-Lewis said. "My friend said 'Oreo would be so good at this.' They were saying all you need is a dog that …