Charli, there's lots of very bad misconception outright lies, and myths about M-44's, their use, and dangers.
I'll do my best to clear up some things.
First, here's an M-44 and the warning signage required to be placed in several locations around each device.
There's no explosive. There's no firearm cartridge. The spring in the device is about as strong as a clothespin spring... much less than a mouse trap.
The device is triggered by a coyote pulling a bait soaked cotton collar at the top of the device (it's brown in the photo)
To pull the bait upward trips the spring, and releases a small puff of cyanide powder directly into the mouth of the coyote, killing it on the spot.
The cyanide capsule has one gram, and is white on the left side of the photo.
The device targets only coyotes. Domestic dogs can pull the M-44 and have the same consequences. I sure wouldn't let my dogs run untended in an area with M-44's... But again, the signs are at all entrances to the property, along fences, and multiple signs are placed at various distances in the proximity of the deployed device itself.
Only a rancher or Wildlife Specialist that are certified with very stringent training and rules are allowed to use, possess, or have contact with M-44's.
In the event of accidental exposure, there's an antidote shot. But you'd better get it quick.
There's a few cases of collateral damage to pets, but they are very rare. Not aware of an instance where humans were harmed (Although the radical Left will tell you there are, I know that they would be dead within mere feet of getting a dose, so I know they are lying.)
The M-44 is only one tool in predator control, and isn't used as much as you may think.
Leg traps, and snares account for most of the animals taken.
Leaning what a calf or lamb actually dies from is a whole other ball of wax. Lots of deaths are blamed on coyotes, but are natural deaths, or they are killed by something else... lions, wolves, or domestic dogs.
There are forensic ways of knowing for certain what killed a calf or lamb. I have necropsied many animals, and most of the time, it wasn't what the rancher thought it was.