Yes, dogs are usually interested in mouse nests etc (although the mad hatter tea party made me laugh outloud! Great image
) For HRD dogs, it is distinguishing between the interest of a 'cool' smell and them actually working and alerting on the source odor (yes, mice have been known to bring a finger or toe or some other body part into their little nook...eww) . It is truly astounding the fine tune instrument God gave this animals, and how we can train them to find what we want them to seek out..
I ran 3 trails yesterday. One was the longest aged urban trail I've so far attempted, mostly blind (I had an overlay of the trail on my phone and glanced at 2x for confirmation my girl was working...even though I had little doubt she wasn't due to her body language). It was just shy of 2 weeks old and she was amazing!!!!! Blew my mind! NO direction from me as I did not know where the trail was, even upon the 2 glances it was literally a chance to see if my line overlay the track layer line. I then brought both dogs home and, from the house had a family member who lives here lay a trail on the property and then off the property. My boy went first and took a moment to find the DOT (literally out the back door which is our main entrance) before he settled and nailed the trail, including the backtrack (because few track layers can follow directions, lol).. I then did my girl, same style; from out the back door on the property to off the property but a different direction). She took less time to get DOT and pretty much ran (ugh) the trail with precision.
I am blown away at the ability to distinguish the freshest track over the multitude of scent pools, layered trails that were minutes to hours old, and get the correct one. To work a very old aged trail and a hot trail in the span of an hour, and nail it! The hot trails were almost double blind (suggestions were made with various options, otherwise my wandering track layer might have gone 10 steps and 'finished, or gone 2 miles and 'finished', lol) but I had no clue how those options would be put together, or even if they would be...
I will work my dogs with source out and articles out. Give them a command for the specific odor and watch them work for that odor. Turn around and work the other odor and they single that one out.. Just amazing!! Dogs noses are truly a work of art.. a MASTERpiece!