Most sniffer dogs working odor exhibit some specific behaviors:
1. Excited breathing on the start line and pulling in one direction
2. Change of behavior when dog encounters odor
3. Head snap
4. Bracketing
5. Sourcing, often associated with different sound and depth of sniffing
6. Breathing stops when many dogs reach source (the highest concentration of target odor), then resumes after a brief pause
7. Trained final response e.g. sit, down, freeze like a statue, etc.
If all of the above behaviors occur, the dog probably detected and found odor.
Note that not all dogs perform all of the above behaviors at every search. For example, if you haven't trained a formal indication, you may see the change of behavior followed by the head snap, movement towards and object and then stopping to look at the handler. If there is an overwhelming amount of odor, the dog may display a change of behavior, but be unable to pinpoint source. Inexperienced dogs spend more time and wasted energy passing source and bracketing. Every search is different.
In a clear room, these behaviors are generally absent. Note that your dog's breath is probably different when he's working a distraction compared to working odor (provided that the dog understands his job).
In this video, sniffer dogs demonstrate the special sound of breathing while sourcing, followed by a pause in breathing when they arrive at source. The first segment shows Boo's interior search, followed by Fiji. Close your eyes and listen for the moment their breath stops.
Read the entire blog post at https://wp.me/p74GTg-qC.
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