The word "sniffer" refers to someone or something that detects or "sniffs out" a particular thing, like smells or signals. It can also be a device or software used to find and analyze data on a computer network. Full definition
It is important not to treat the capacity and accuracy of sniffer dogs as interchangeable. (blog.privacylawyer.ca)
As such, another interesting aspect of security that has seen a rise in recent years is the use of sniffer dogs within schools and colleges. (educationbusinessuk.net)
They are used as sniffer dogs on a widespread basis. (dailypuppy.com)