Very nice post but I did want to mention that it would seem that we do not know if the training at that time was the same as now or as thorough or was checked in the manner you describe modern day Kennel Club procedures etc. When this case came through way back when (1938) I do not know how the dogs were trained. Has your research shed any light on this aspect of things? Thanks.
I have read some very good books on training tracking dogs which were written in the 1950's and 60's. And those books referred to methods of training that had been around for years. I cannot, however, answer your question as to exactly how things were done in 1938.
Dogs have been used for tracking for hundreds of years. What the dog does and how he processes the scent information is the same now as it was in the beginning. I think that maybe the training has developed and progressed over the years - more for the benefit of the handler than the dog.
Some breeds are more suited to the task than others, but almost all can be taught to track.
You really don't teach a dog to scent. He does that naturally. But you have to keep him focussed, lengthen his attention span, speed, and endurance - all by keeping him happy and challenged. The dog needs to be taught what the handler wants him to do with his scenting ability, and the handler needs to learn to believe in his dog's natural ability.
There is no way that a human can begin to understand exactly how the dog's nose and brain work, but by understanding a bit about what he does and getting him to work with the handler, you can form a very effective search team. Like anything else, practice and experience make the team better.
In a perfect world, tracking dogs could make very short work of locating lost persons. But the world is not perfect. Besides all of the limiting factors like rugged terrain, water, cold, heat, rain, wind, skill level of the team, etc. , there is the factor of WHEN the team is called in. Many times, the area is saturated with searchers before the tracking dog team is called in. Sometimes the team is not even given an initial scent item or likely starting point, but rather dropped off in the middle of nowhere with a lot of inexperienced volunteers to get in the way.
Other times, as in this case, although the dogs did their job and followed the scent - it seems that other factors (vehicle) prevented them from finding the child.