Due to their incredible olfactory abilities, dogs have been used by law enforcement agencies for over 100 years. The English used bloodhounds while searching for Jack the Ripper in 1888. This book details the specialized jobs performed by police K-9 units. Under the guidance of their trainers, police dogs can sniff out drug smuggling operations, terrorist activity, and help to locate and rescue victims. Includes fact boxes containing numeric factoids and statistics.