Clancy is the country’s only known mercury smelling dog. He and his owner roam around the hallways of Minnesota schools sniffing out the culprit. Around 40% of the schools that they visit have had some mercury detection usually due to a mercury spill in the plumbing. When Clancy finds mercury, he receives a treat. Clancy and his owner say that they are safe from the mercury because they get in and out of there quickly and are checked for mercury poisoning on a regular basis.