K-9 has a variety of entries, all related to dogs, by virtue of the pronunciation being similar to 'canine'.
- K-9 is the name given to departments of the police that use dogs in their work in the United States.
- K-9 is the name of several robotic dogs which were characters in the BBC television drama Doctor Who, and the short-lived spinoff series K-9 and Company. There were three in all, all represented by the same radio-controlled prop.
- K-9 is the name of a police-dog film with James Belushi released in 1989: [1]
- K-9 Kadets is a movie released in 1944: [1]
- K-9 and Company is a TV series released in 1981: [1]
- K-9 Corrections is a TV film released in 2001: [1]
- K-9 may refer to zoophilia.