The Velodog Revolver was a very small pocket 5-shot pocket revolver that fired 5.75 mm (.22 calibre) Velo-dog cartridges in order to kill or scare away dogs chasing bicyclists. Bicycles were originally called "velocipedes," hence the name of the gun.
Created in France in 1904 by René Galand, the son of gun maker Charles-François Galand, the weapon had no trigger guard, instead having a trigger-lever that folded into the body of gun when not in use.
The more humane cartridges were loaded with cayenne pepper or salt, or had bullets made from wax, wood, or cork. Less humane bullets were lead, but had a fairly low amount of powder.