The relatively swift development timeline of the Japanese Spitz in the 1920s and 1930s suggests what about its selection process?

Answer

It suggests a more artificial selection process driven by aesthetics

The development occurred in a short, concentrated period, suggesting an artificial selection process driven by aesthetics and a specific social niche rather than gradual adaptation to a working role.

The relatively swift development timeline of the Japanese Spitz in the 1920s and 1930s suggests what about its selection process?
Dogbreedspitz