Meaning of 追跡犬 in Japanese

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Definition of 追跡犬

いぬ(inu) 【犬 ·狗】

(n) dog (Canis (lupus) familiaris)
彼女は吠える犬を怖がる。
She is afraid of barking dogs.
snoop (i.e. a detective, a spy, etc.)
気をつけて。警察の犬がかぎ回ってる。
Watch out! A police spy is snooping around.
(n-pref) counterfeit; inferior; useless; wasteful

ついせき(tsuiseki) 【追跡】

(n, vs, adj-no) pursuit; tracking (e.g. in computer graphics); keeping records on; tracing
その警官は泥棒を追跡した。
The policeman chased the thief.