GrainneDhu
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I know there are different types of dogs: there are tracking dogs, air-scent dogs, cadaver dogs and other specialized types of dogs.
I know a cold and damp area is preferable over a hot and dry area for tracking purposes (wasn't it hot and dry at that time?).
I know grass and bushes and soft surfaces are preferable to hardened surfaces like asphalt and cement (lake area would have been a mixture of these surfaces).
I know dogs track from the oldest scent to the newest scent.
And I know that some dogs can track a scent (depending on the type of dog) up to a few weeks, maybe even a month or more in ideal conditions.
Now, since the girls rode the bikes everyday for at least 5 days (I've linked to this info in a quote by Misty in a previous post) and even they rode the bikes that day, how can we be sure that the dogs were tracking rafts from the girls themselves and not rafts dispersed from the bicycle? If a shoe or shirt can hold enough scent to track, surely a bicycle handled, sweat upon and sat on for days at a time would carry a strong scent. I've tried searching for this info myself and there doesn't seem to be much info on how that would help (or confuse) a tracker. Would handling an object covered with rafts (carrying the bicycle) transfer enough of them onto another person for a dog be able to discern the difference?
The weather was horribly hot and humid at the time.
It isn't likely that handling an object would transfer enough skin rafts to another human being to lay a good trail. There's a fairly frequently done demo that disproves the idea: a tracklayer and another human being give each other a big ol' bear hug trying to wipe as much skin area over each other as possible in a public place, then walk side by side for a distance. At some point, the tracklayer separates from the other person and continues to lay track in a different direction.
Even when this is done with identical twins (as in the demo I watched), the scent dog had no problems at all when the designated tracklayer turned away from her twin. That dog followed the designated tracklayer like his nose was on rails.