The Dominion 500mm Lupus Cannon
Simply put, it is a cannon that shoots wolves as projectiles. They were used mostly in the war of 1812 when the US tried to invade Canada, but they fell out of favor after WWI with the invention of automatic weapons. Especially when the wolves proved to be ill equipped to handle Poison Gas. They attempted putting a gas mask on a wolf, but it just never really worked because of the extensive training needed to keep the wolf from ripping the mask off. The Dominion Arsenal Company discontinued the Wolf Cannon in 1919 and switched over production to the Hout-Ross Automatic Rifle. The Hout-Ross is much more practical with its 25 round over the barrel ammo drum, as well as the fact the ammunition never tries to bite your face off.
However, old wolf cannons still remain in use to this day, as long as they are well maintained. Their longevity is a sign of real craftsmanship and the amount of time and dedication taken to produce each cannon. Back then they were made by hand and the quality shines through. You often see them in war reenactments, but due to Federal regulations protecting wolf populations, they almost always use rubber molds that resemble wolves, instead of actual lupus as the ammunition.