Police dogs, often referred to as K9s or K-9s, are specially trained to assist law enforcement officers in tasks ranging from tracking suspects and detecting narcotics to locating missing persons.

A Wilmington police therapy dog was killed Tuesday morning in a head-on car crash in Tewksbury, according to police. Zena, a 3-year-old Bernese mountain dog-poodle crossbreed, died after a driver ...