A dog who was rescued by an Ohio animal shelter has a new leash on life as a K-9 officer.Tattoo — a three-month-old, 35-pound Labrador/pitbull mix — last month joined the Swatara Township Police Department in suburban Harrisburg, Pennsylvania.He was rescued from the Franklin County Dog Shelter & Adoption Center near Columbus, Ohio.Tattoo was selected by the therapy K-9 unit of the Franklin County,