Killer, the dog of Dale Earnhardt Jr., driver of the #88 National Guard/AMP Energy Chevrolet, poses in the garage area during practice for the NASCAR Sprint Cup Series Coca-Cola 600. (Photo by Geoff Burke/Getty Images for NASCAR) hide

Killer, the dog of Dale Earnhardt Jr., driver of the #88 National Guard/AMP Energy Chevrolet, poses in the garage area during pr... more