I can easily see things quite a ways in the distance. As Louis Armstrong sang in one of my all time favorite songs, What a Wonderful World

“I see trees of green,
red roses too.
I see them bloom,
for me and you.
And I think to myself,
what a wonderful world.”

I, like other humans, am able to easily see things at a distance of … say, 1/3 of a mile or so. If we were switch that “seeing distance” to that of using our noses to detects scents at an equal distance, well, dogs would be able to detect the same scents, and more, at a distance of a whopping 3,000 miles away. That’s how much more acute a dog’s sense of smell is compared to ours.

Let that sink in for a second. If our noses were able to smell at distances equal to how far we can see, and humans smell a steak sitting on a platter that’s positioned 1/3 of a mile away. A dog has the built-in ability to smell that same steak placed in a location that 3,000 miles in the distance.

Okay, we agree. A dog’s nose is a dog’s superpower. In fact, it’s so powerful that a dog could, if it desired to do so, detect a single spoonful of sugar in a million gallons of water (two Olympic-size pools).

As a former K-9 handler, tales (pun intended) of amazing sniffers fascinate me. For example, the dog who detected 35 pounds of marijuana wrapped in watertight material and submerged in a car’s gas tank that was filled to the brim with gasoline. Another dog, a cancer-sniffing dog insisted on melanoma in a spot on a patient’s skin that doctors had pronounced as cancer-free. Finally, after more testing (because the dog insisted), a biopsy confirmed melanoma in a small fraction of the cells. This SuperDog, of course, dropped the mic and left the building.

So, in the field, how do dogs use that extraordinary group of sensors to zero-in on their targets (narcotics for drug-detection dogs, explosive for bomb dogs, etc.).

This is where Scent Cones come into play. Before we dive in completely, first remember that the best conditions for a dog to search (outdoors) is when the temperatures are cool, but rising slightly, a bit of humidity, and little or no wind. Wind is not a friend, but doesn’t stop the dogs from getting the job done. It does, however, alter the direction of the scent cone.

A scent cone is simply an imaginary cone-shaped area that begins at the source of the odor/scent (a body, drugs, a firearm, explosives, etc.).

The handler ideally starts the dog in a position that’s downwind from the area to be searched. If the area is hilly and the temperatures are hot, the dog should start in an elevated position since the air (scents) will be rising.

Once in position, the dog heads toward the scent, criss-crossing its way back and forth through the scent cone. I know, clear as mud, right? Let me see if I can find that sketch … Okay, I have it and I’ll tape here so you can see it while I describe what you’re seeing.

Okay, the dog starts its search at the wide end of the scent cone (to the right in the image above). The cone represents the space the scent travels along the breeze/air. It’s strongest in the center, but gradually fades the further you move away from the middle of the cone.

Therefore, when we see the dogs running back back and forth, what they’re actually doing is running until they no longer smell their target. When that happens they make a U-turn and run in the opposite direction until they no longer smell it in that direction. Then they once again turn and go in the opposite direction until they scent is no longer detected. They continue this pattern all while moving closer and closer to the scent. As they move toward the scent as it grows stronger.

Finally, they reach their target and the handler gives them their toy as a reward for doing a fantastic job. The toy, after all, is what they’re after. Not a dead body or a package of cocaine. Finding the target of their search is merely the means they use to get to their beloved toy and a bit of fun time with their handler. Believe me, these dogs are full of energy and they love to run and play and jump and … well, they love being dogs, and that’s part of what keeps them in such great shape, physically.

Remember, scent cones move with the breezes, heat, cool, etc. Dogs know where to go and what to do. If mistakes are made, they’re made by handlers who think they know more than their dogs. We don’t. As my instructor at the Virginia State Police Academy used to tell us, “The dogs are on the smart end of the leashes, not you. Stop trying to think and trust your dogs!” Then we’d run a zillion miles. It was his gentle method of helping those words sink in. See, Lieutenant, it worked. I still remember!

5 replies
  1. Rose
    Rose says:

    My cadaver dog and I agree. Actually him more than me. After all I’m the dumb end of this team! 🙂 Very nice summary.

  2. Gina
    Gina says:

    Lee, maybe you can only see 1/3 mile or so. I’ve seen stars that are billions of miles away.

    • Pat
      Pat says:

      No, you don’t actually see the stars. You only see the light that each star generated billions of years ago that is just now reaching the earth. If a star exploded today (nova or supernova) you would only see the light from the event long after the star ceased to exist.

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