Back around 1900, bike riding was popular. Bicycles were called velocipedes. Dogs chase bikes. In the time before rabies vaccine, getting bit by some stray on a country road was a bad idea.
Small, folding trigger revolvers were made.
They were called velo dog (velocipede dog). Made for shooting the stray dogs that chased you. They were chambered in various low-powered rounds, including 25 ACP, but one especially was designed for them. The 22 Velo Dog. Also known as the 5.75mm Velo Dog.
Meddle not in the affairs of dragons, for thou art crunchy, and taste good with catsup - George of Lod, Year of Our Lord 297
I always take precautions.
Beware the Evil Bullet Fairies.