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K9 or K-9 may refer to:

Homophone for canine[edit]

Fictional dogs[edit]

  • K9 (Doctor Who), several robotic canines in the British science fiction television series Doctor Who
  • K-9 (Looney Tunes), Marvin the Martian's pet Martian dog in the Looney Tunes cartoon series from Warner Bros
  • K-9 (Transformers)
  • K9 Murphy, a mechanical dog in the Japanese television series Tokusou Sentai Dekaranger


  • AMD K9, a microprocessor
  • K9Copy, a DVD backup and authoring program for Unix-like operating systems
  • K-9 Mail, a mail client for the Android operating system
  • K9 Web Protection, Web content control software


Military and weapons[edit]

  • HMAS K9, an Australian submarine
  • Pusan East (K-9) Air Base, an abandoned air base in Busan, South Korea
  • K9 Thunder, a 155 mm self-propelled artillery used by the Republic of Korea Armed Forces
  • Kahr K9, a 9×19mm Parabellum semi-automatic pistol manufactured by the American company Kahr Arms
  • K-9 (missile), a Soviet short-range air-to-air missile