From what I gather this goes back 50 years. 50 years ago there were a lot of social secrets and taboos that wouldn't be spoken about in public... Heads in the sand was the order of the day.
On the dog training, most gun breeds, especially Spaniels just have a natural instinct bred into them to flush out things. You just have to encourage this when they're young. This morning my Cocker bitch routed a hen pheasant, 2 squirrels and her latest discovery is hibernating mices in grassy tufts... when that becomes a sport, I've got a ready trained dog to clean up with.