I had read an article some time ago about tracking dogs, and I didn’t get to respond to it then. However, here is my experience. It’s not the dog you are trying to beat; it is the handler.
I have a lot of experience with tracking dogs. I used to guard the copper pipeline in Indonesia. The copper mine (also containing some gold) was on top of a mountain. Once the material was taken from the ground, it was mixed into a slurry and pumped miles through the jungle to the port. This pipeline was under constant attack. People would cut into the pipe, fill some buckets, and run off into the jungle. We would have to track them with dogs, in the hopes of arresting them. Usually it was the military or police doing the cutting, so there was plenty of incentive to get away.