What subsequent development, besides wartime losses, reduced the need for the Picard after the global conflicts?

Answer

Modernization of agriculture

Following the wars, the modernization of agriculture brought changes to farming practices which subsequently reduced the need for traditional, itinerant shepherds and their dogs.

What subsequent development, besides wartime losses, reduced the need for the Picard after the global conflicts?
raceOriginDogbreedingBerger Picard