Everyone's skin cells smell unique, which is how a SAR dog can smell an item of clothing and search specifically for the last person who wore it. While it's impossible to know for sure, most experts believe that SAR dogs are smelling these rafts, which form a "scent cone" that the dogs can easily pinpoint when they're performing a search. Human beings are smelly creatures - they constantly shed dead skin cells called rafts, which contain bacteria and smell, well, distinctly human. This all might sound difficult to you, but to a SAR dogs, it's a breeze. SAR dogs find missing persons, search disaster areas for survivors and bodies, and locate evidence at crime scenes, all by focusing on the smell of a human being. This may be in the form of a living person, a dead body, a human tooth or an article of clothing. SAR dogs can do a lot of amazing things, including rappel down mountainsides with their handlers, locate a human being within a 1640-foot (500-meter) radius, find a dead body under water, climb ladders and walk across an unstable beam in a collapsed building, but it's all toward a single end: Finding human scent.
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