a person or thing that sniffs.
a device or mechanism for detecting something.

1860–65; sniff + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sniffer (ˈsnɪfə)
1.  a device for detecting hidden substances such as drugs or explosives, esp by their odour
2.  a computer program or device used to monitor, detect, and capture data on a network

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Computing Dictionary

sniffer definition

packet sniffer

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
The device is a thousand times more sensitive than the current gold standard in
  explosives detection: the sniffer dog.
Specially trained sniffer dogs can smell something on the breath of lung cancer
Sometimes a small, friendly sniffer dog comes around for a preliminary check.
The group doesn't stick a sniffer inside a closed car and consult a gauge.
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