noun
police dog; K9
Refers to a dog trained and used by police forces for tasks such as tracking, detection, and patrol.
警察犬が行方不明の子供を見つけた。
The police dog found the missing child.
空港で警察犬が麻薬を探知した。
A police dog detected drugs at the airport.
盲導犬 is a guide dog for the visually impaired, whereas 警察犬 is a working dog for law enforcement.
Compound of 警察 (police) and 犬 (dog). A straightforward modern term with no obscure historical derivation.