This is from a book that is used as part of the hunter training curriculum in Switzerland:
The book is called Jagen in der Schweiz – Auf dem Weg zur Jagdprüfung, which also comes with videos.
In Central European countries, hunting licenses are not as easily procured as in the United States or Canada. In those countries, it really is expected that the hunter be a true naturalist and possess a deep understanding of natural history, ecology, marksmanship, and bushcraft.
The golden retriever is depicted with other typical hunting breeds that would be used in Switzerland, including leashed scenthounds, spaniels, HPRs, and setters. The author apparently knew that the best way to show a working golden retriever is to show one from working bloodlines, which are not necessarily the most common type in Europe.
I saw quite a few of these dogs in Bavaria a few years ago, but the bulk of the European population is the cream-colored, heavily-built type.