An Arizona man reportedly shot and killed a 9-year-old pitbull mix after it approached his own dog in a park full of children playing. Shauna Patterson, the owner of the dead dog, told WFSB that Matthew Tardy overreacted when her dog, which was named Maxx, got loose. She said that one of the children dropped the leash and Maxx went running toward the park. When Patterson caught up to the dog, she said, Tardy had it pinned to the ground. "The man then pulled a gun, held it to Maxx's head and shot him in the head. The kids were probably six feet away,” Patterson said. Police have launched an investigation into the inicdent.