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Throughout North America, I keep seeing police cars labeled "K-9 unit". I know "K-9" is a homophone of "canine", but why don't they just use "Police dog"?

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    You have to use something. You could say "police dog", or you could say "canine unit", or you could say "doggy-doggy goo-goo", or a million other things, and so can everyone else, and then we all have to agree on which term is the universally accepted one. That is just how language works. If they used "police dog", you'd be asking the exact opposite question now. You have to use some term that works, and "canine unit" is a term that works, and that is all there is to it. – RegDwigнt Aug 27 '14 at 8:29
  • Plus I think it's shorter and more readily comprehended when printed in large letters on the sides of police vehicles. – Jim Aug 28 '14 at 0:51
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    @RegDwigнt: huh? By that logic we should be using the weirdest synonyms instead of common words all the time. Have I asked why a "dog" is a man's best friend, and not a "K-9 unit"? No. – Dan Dascalescu Aug 28 '14 at 11:18
  • What is behind the question, and what the question does not fully spell out is that K-9 seems to be deliberately obfuscating. Somebody who sees K-9 for the first time is bound to wonder what it means and to presume that there is also K-1, K-2 . . . K-8. – jsw29 Jul 27 at 21:34
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The term appears to originate from the term "K-9 Corps", being a shorthand for the Army's War Dog Program established during World War II. (http://www.qmfound.com/K-9.htm).

Also, "K-9 Unit" is often used to refer to both the police dog as well as its handler. So a simple replacement with "police dog" would be insufficient.

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    This doesn't answer the question, but merely moves it one step back: why were the K-9 Corps of the Army's War Dog Program so called? – jsw29 Jul 27 at 20:54
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Origin of the term 'K-9 unit'

An Elephind newspaper database search turns up at least one instance of "K-9 unit" from World War II. From "5th Infantry Dog Up to Snuff With '201' File" in the [Colorado Springs, Colorado] Camp Carson Mountaineer (November 11, 1943):

It is not unusual for a soldier to have a personal (201) file in Regimental Headquarters. This is standard operating procedure. Not is it news when a dog bites a man. Bu this is a case where the dog involved did not bite anyone—but has a file (201) all his own.

The canine in question answers to the name of Charley. He is owned and operated by the Regimental Adjutant, Capt. Adelbert Boggs. Charley i a fine, year-old Doberman Pinscher. He joined the Regiment way down yonder at Camp Van Dorn.

The file keeper, S/Sgt. Saul Kash is in charge of Charley's 201 file as well as those of the entire Regiment. He says that Charley's dossier is quite complete. It contains Charley's admittance date to the Fifth—and very valuable documents surrounding the pup's efforts to join the fighting K-9 unit. This, as you know is the corps of trained dogs which is proving of such invaluable assistance to our sentries everywhere.

Newspaper references to "K-9 corps" during the same year are far more numerous, however. Here are the earliest three such instances. From "Two Coronado Dogs Accepted by Army's 'Dogs for Defense'," in the Coronado [California] Journal (January 7. 1943):

Forty-one San Diego county dogs to date have been accepted for service in the new K-9 corps of the United States Army, it was announced by officials of Dogs for Denfense, Inc., in charge of recruiting of the canine-soldiers in San Diego and Imperial counties.

"Denfense" appears to be a typo, but with stories like this one, you never know.

From "Falla's a Private," in the [Newburgh, New York] Stewart Field United States Military Academy Prop Wash (March 9, 1943):

Falla, President Roosevelt’s Scottish terrier, has gone to war. He hasn’t joined the K-9 Corps, for he isn’t big enough. But he’s a private, thanks to the President’s personal $1 donation to the War Dog Fund. The dollar entitled Falla to the rank of either an Army private or a Navy seaman, and the President asked that Falla be made a private. War Dog Fund has turned over $15,000 so far to Dogs for Defense, national procurement agency of dogs being used by the various military services at home and abroad.

From an untitled item in the Suttons Bay [Michigan] Courier (April 8, 1943):

They’re in the army now—bow wow, and how! Tens of thousands of America’s dags have gone to war, in the K-9 corps. Read of the splendid job they’re doing and how they’re trained, as told by Louis de Casanova, former editor of the Kennel Club Gazette, in The American Weekly, the magazine distributed with next week's Chicago Herald-American.

None of these early instances explains the origin of the name—but presumably that's because it was obviously chosen as a visual pun—making the verbal connection between the word canine and the military inclination to organize individuals (whether people or dogs) into groups with numerical IDs. The fact that "K-9 corps" and "K-9 unit" were appearing in newspapers across the country—from New York to Michigan to Colorado to California (along with instances in newspapers from Indiana, Texas, Virginia, and Hawaii)—within the year 1943 indicates that the name caught the fancy of working journalists (and evidently the U.S. public as well). I didn't find any mentions of "K-9 unit" or "K-9 corps" in the Elephind database from 1942 or earlier.


Man-dog team or police department subunit?

It seems worth noting that "K-9 unit"—like "K-9 corps"—originally applied to a section or group of trained military dogs, not to a particular pairing of a dog and its handler. In modern policing, however, people sometimes apply the the term "K-9 unit" to a man-dog team and sometimes to the unit of the police force that consists of such teams. Thus, for example, from "Local Man Fires Shot at Burglars, Suspects Escape Police Dragnet," in the Louisville, Colorado Times (December 5, 1990, page 11) we have an instance of the "man-dag team" sense of the term:

Louisville police also requested a K-9 unit from the Boulder County Sheriffs Office, but no dog units were available for the search. Somehow the two young burglars managed to elude the dragnet. Glass said their escape was especially frustrating, as they may be linked to burglaries in Broomfield and Longmont.

But far more common in Elephind's newspaper matches is the term in its departmental sense, as in this instance from Shawn Dockry, "Kent Police Praise Dog Unit," in the [Kent, Ohio] Daily Kent Stater (April 5, 1991):

The Kent City Police and the Portage County Sheriffs departments literally want to take a bite out of crime with their respective K-9 units.

Portage County Sheriff P. Ken Howe said his dog unit started six months ago with one dog, Erd, pronounced 'Ed.' A new dog was added to the unit in March.

"The dogs are to us what the horses are to Cleveland (police units)," Howe said.

The creation of the K-9 unit was a campaign promise of 1988, Howe said. The dogs are used to track lost people and suspects, to sniff out drugs and to back up officers.

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    Normally, we don't expect an official name of something within a government entity to be a pun. While it is not too difficult to understand how some people may have started using K-9 among themselves as an in-joke, it still remains puzzling how it could have become a term that is widely used in formal, official contexts. – jsw29 Jul 28 at 14:49
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    @jsw29: On the other hand, the U.S. military seems to have gone to great lengths in 1942 to construct a cute ocean-appropriate acronym for women serving as auxiliaries in the U.S. Navy (the naval analogue to the Women's Army Corps). The simple, logical name would have been "Women's Naval Corps," but the official one that the government actually adopted was "Women Accepted for Voluntary Emergency Service" ("WAVES"). – Sven Yargs Jul 28 at 19:12
  • True, but WAVES is quite different from K-9, because everybody who sees WAVES will immediately know that it is an acronym, and that to understand it, one needs to find what it is the acronym for. On the other hand somebody who sees K-9 unit for the first time, will assume that it stands for the ninth among K units; it is unlikely to immediately occur to one to look for a word that is pronounced similarly to K-9. It takes a while to 'get' the joke, because one doesn't expect that kind of a joke in such a context. – jsw29 Jul 29 at 15:20
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1) "K-9" or "K9" -- a typographic pun upon "canine", inherited from military jargon. They could have said canine, or dog (though someone would surely then complain that they weren't giving bitches equal credit). Someone just happened to like this bit of jargon, and it stuck.

2) "K9 Unit" -- The "unit" isn't just the animal, but the team of the animal and its handler.

(The term sometimes also includes the vehicle, when it has been specially modified for this purpose. For example, the local K-9 units have the handler carry a transmitter which can remotely release the dog from their van. They do "live training" demos of this at some of the local fairs, showing how quickly the dog can be out of the van and assisting. I'm not sure whether the transmitter has a deadman/man-down sensor or if the officer has to explicitly press a button; if I was designing it, it would support both modes.)

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