Physical Danger
It's safe to say that anything capable of cutting apart a pig is capable of causing a little damage to their own body if tools are mishandled. From the cleaver to the meat slicer, your safety lies 100% in your own hands. It doesn't matter what's going on around you—screaming kids, jackhammers across the street, your ex wanting to get back together—you need to focus, focus, focus.
Butchers also face some less gory dangers. Being on your feet all day can have some long-term consequences; and proper hand-washing technique is a must, even when you've been wearing gloves. Raw meat can have all sorts of gross things in it. Luckily, it's nothing a little soap and water can't fix.