sniffer dog

[snif-er dawg, dog]

noun

a dog trained to find illegal drugs or explosives by smell.

Sometimes sniff dog [snif dawg, dog] /ˈsnɪf ˌdɔg, ˌdɒg/.
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British Dictionary definitions for sniffer dog

sniffer dog

noun

a police dog trained to detect drugs or explosives by smell
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012