The .44 Bull Dog was an American centerfire revolver cartridge produced from the 1880s until the 1930s.

[1] No known firearm was chambered exclusively for the .44 Bull Dog cartridge: It was a shorter and less powerful option for use in revolvers chambered for the .44 Webley cartridge (American name of the British .442 Webley revolver round).

The .44 Bull Dog cartridge was manufactured in the US and Canada, probably for those bothered by the sharp recoil of the more powerful .44 Webley round in such small guns, or who were particularly cost conscious.

It proved a great deal better than contemporary rimfire rounds, being in a class with the .41 Short Colt.

[8] However, by modern standards, the .44 Bull Dog was an extremely marginal round, not really suitable for anything but close range, which is how it normally would have been defensively used.