When my Belgian Sheepdog (Groenendael) boy was a puppy- first day home- I took him into the woods to go potty. He walked around a bit, then suddenly, took that cute, needle nose of his and plunged it into some pine needles and pulled out a baby rabbit. I would have NEVER have guessed a bunny to be there. But he did, right away. Bunny was dead instantly.
They say that a dog with the worst sense of smell (for a dog) has an infinitely better sense of smell than a human, which of course I believe. It’s amazing to think about them being able to recognize discrete smells the way they do. I played a little bit with tracking years ago with one of my goldens and it was a piece of cake to train her. The tracking itself wasn’t hard, just getting her to understand what I wanted her to do, but once she did she had no problem following a track.