Catching a scent from a long distance is very common in SAR. I've been on one hill side (ridge) and had my dog indicate she had scent when the person was on the ridge across from ours. Pretty long distance away.
I've had another dog give a firm alert on a scent 3/4 of a mile from the victim who was across a bean field sitting on a porch.
As Mr. Sheldahl stated, you have to look at the environment, terrain and the situation with which you find yourself. I have to use the phrase so forgive me, but back in the old days, when MWD's worked perimeter, alert aircraft areas and bomb dumps, your post may be 200 meters deep. Since it was a restricted area, and no one was allowed in that particular area, it was not uncommon to detect an intruder at 150 meters, if the handler was patroling the post properly. Scout dogs depending on the prevailing wind etc were usually reliable within a 100 meter area. Keep in mind though that sight and hearing were both utilized to the maximum during training. The little known water dog, used to detect enemy divers often gave an indication of someone being present at much greater distances, sometimes up to 300 meters, of course the trick then was to locate the diver. A police dog is often worked in areas with a higher level of distractions, including scent contamination.
DFrost
Any behavior that is reinforced is more likely to occur again.
VC,
My longest wind scent during work was about 200 yards. But that was on a golf course at night with a 15-20 mph wind. Boy was I surprised to find the guy hiding in the bushes!
Campy, you probably won't see that kind of distance on this side of the mountains unless the conditions are extremely good. But on the east side, conditions are more favorable for longer distances. At least, that's what I've experienced. We did a joint training on a defunct golf course on the east side, and many of the dogs, including mine, were catching scent anywhere from 150-200 yards out. Here on the west side, there are too many drainages and trees for scent to travel unobstructed like that. However, at about 3am on a cool night with a steady breeze, it can happen. <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />
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