K9 (or K-9) refers to a variety of entries, most related to dogs. The term originated in the military, where designations such as G-2 are common, making K-9 a rare official pun, being similar to "canine". The term, originally referencing war dogs, has since carried over to police, and sentry and assistance dogs as well.
K-9 (Doctor Who), the name of several robot dogs which were characters in the BBC television drama Doctor Who
K-9 and Company, the pilot for a proposed television series spinning off from Doctor Who, released in 1981
K-9 (TV series), a yet-to-air 26 episode animated Doctor Who spin-off featuring K-9.
HMAS K9, an Australian training submarine used in World War II.
K9, one of the grade of the optical glass.
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