"C'mere, Thor--c'mere, buddy," Scott Derrick says gently as he beckons his 12-year-old dog out of the shade provided by his rusty 1979 Ford pickup. A German shepherd-Lab mix with soft, sleep-caked eyes and a woofy bark, Thor struggles to his feet and ambles over. His gait is unsteady, as if his withered hindquarters were bound by an invisible rope half a... More >>>