sniffer dog

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So why not just take a great sniffer dog and clone it instead ?
所以，如果一条嗅探犬非常出色，为什么不克隆它呢？
Still not convinced, the staff called in a Special Weapons and Tactics (SWAT) team and a sniffer dog, but the parcel was later found to contain Asian pears.
由于不能确定物体属性，邮局请来特种武器和战术部队及一只嗅探犬，但之后发现放在包裹内的是亚洲梨。
www.chinadaily.com.cn
Many of us did. But a few, mindful that in a couple of days they would be checking in at an airport, were wondering just how tiny a quantity of opium had to be to go undetected by a sniffer dog.
许多人照做了，但有几个小心的人，想到过几天会在机场接受检查，不知道缉毒犬是不是能嗅出鸦片的味道来。

Now,officials at the Glasgow airport in Scotland are testing a new security device called an "electronic sniffer dog."

a dog that is trained and used by the police or army to find hidden drugs or bombs, or to find someone the police are looking for, using its sense of smell

A sniffer dog is a dog used by the police or army to find explosives or drugs by their smell.