ERIE COUNTY, NY — (EXCLUSIVE) — A family was traumatized when gun-wielding police officers walked onto their quiet property and shot their dog in the head while looking for a man who did not live there. Megan Shimburski, 25, was spending a quiet afternoon with her children at her parents’ countryside East Concord residence on July 25, 2014. It was a normal day, she said, which involved watching her 5-year-old daughter play behind the house with their dog, as her infant son lied in a playpen inside the house. Ms. Shimburski’s parents, John Shimburski and Martha Spaulding, were not at...