WILLIAMSBURG Karen Martin was having a bad year. She had broken up with her boyfriend, money was tight, and then her dog went missing. Willis, a 6-year-old clumber spaniel, disappeared from her Portsmouth backyard Dec. 21, 2009. "Last Christmas was terrible," said Martin, an operating systems programmer for the city of Chesapeake. "I was so distraught." It took almost a year, but Willis came home - thanks to the kindness of strangers and the extensive networking among humane societies and rescue groups. "It's amazing," said Martin, who now lives in Williamsburg. "My chances of getting my dog back after so...