Keller is a happy dog. In photos taken by the woman who loves her, her startling blue eyes twinkle with merriment. But she sees very little through those eyes. She was born partially blind. Because ...

When motorcross bike rider Mike Schelin, 41, first got his dog Opee in 2002, he had no idea the blue merle Australian shepherd would become his race partner. "I love dogs and couldn’t believe how I ...