I've been watching this video from Cruft 2015, that's a demo from obedience winners.

If you fast forward to ~10' there's the scent discrimination exercise.

It seems that the correct cloths have a red mark on them. Is it always the case? Won't the dog just pick that one all the time then?

Edit: again in this video where the correct cloth is clearly different from the others.

  • The red on the first one is not very visible in the video, but the second one at 10:50 it was very visibly a large red corner on an all white cloth. Hard.to imagine that color is not the trigger. May 14 '15 at 10:04
  • I took some stills from the video and ran them through this tool and there's an obvious spot on the cloth from the red (turned grey) flag. It's an interesting question!
    – Zaralynda
    May 16 '15 at 0:23

Dogs cannot see red... it would appear as a light to dark shade of gray, depending on the intensity of the red.

But a sense of smell is by far a dog's strongest sense, and a dog will rely on that by default more than their sense of sight. My dogs are in Canine Scent training, and it is amazing how they can pick up an odor that is being carried by air currents. Much of our training is for me to learn to pick up on the cues that a dogs gives me when they are in odor. I believe that a dog trained to search for scents would follow the odor long before they notice a marking.

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