Just one cottontail rabbit.Have you ever seen a dog, cat, possum, skunk, or coyote die from eating dead rats or just the poison?
I don't care to argue, but surely you understand there's a difference between the impact a few ounces of poison versus tens (or hundreds) of pounds will have on wildlife or livestock. AFAIK, there is no poison that is 100% species specific.
I'm all for killing feral hogs. I don't think a landowner (or anyone he gives permission to) should be restricted in any way from hunting/trapping hogs, day or night, using dogs or any optical aid (night vision, IR, etc.) that's available.
I just don't think large amounts of poison is the way to go.