Can pigs die from spider bites?

The Brown Recluse Spider has the strongest venom. It can cause significant cutaneous injury with tissue loss and necrosis. When you see a dark solid spot on the skin like it is very dry, you are problably looking at an necrosis. Its a very bad thing. It will not kill your pig but it will turn bad for consumption.

The Back Widow Spider can inflict a painful bite which can be fatal. If your pig survives the bite, again it will turn no good to eat.