Currently, search and rescue dogs are a valuable ally of corporations such as the Red Cross or the Firefighters .depending on the task that the rescue dog is specialized, we can say that it belongs to tracing dogs or venting dogs. Tracing dogs, as their name says, follow the trace of a person from point A to point B. These dogs need a starting point and some non-polluted piece of cloth of the person to be searched. They are used for finding lost people, and they can also be used for finding fugitives. Venting dogs are those looking for human smell in the air, without following a particular person. These dogs are specialists in finding people buried in land slides, people buried y avalanches, drowned people, human evidences in crime scenes, etc.