Just IMHO, but I don't like to use the term "velo dog" as a generic for any small European revolver of that period. The Velodog was a long 5.5mm (.22 cal) cartridge, resembling the .22 WMR, but centerfire, and revolvers made for it have long cylinders. Most of the inexpensive European revolvers of that era were in .380 revolver, .320 revolver, or later in .32 ACP and .25 ACP, not 5.5 Velodog. But the term Velodog has caught the gun collectors fancy, so almost any old European revolver, especially one with a folding trigger, is incorrectly called a Velodog.
Jim