With six racing dogs to keep in top shape, Dewey Blanton of Columbus, Ohio, has developed a “canine exerciser” that fastens to his station wagon. Blanton built a frame to support a long plank beside the vehicle. Springs fastened to the plank are attached to the dogs’ collars, permitting the dogs to run wide. Longer chains keep the dogs in check. The broad plank bumper prevents injury to the dogs as they race along at 35 miles per hour. Best of all, the dogs seem to love the exerciser.