Sodak, you are so right. We have a lot of feral hogs down here, and they are a lot of fun to shoot, and a lot of fun to eat. The part in between is not so fun.
The sand and grit they have imbedded in their coats is death to a knife edge. What you quickly learn to do is make a short incision, loosen the hide, and slit from behind, from the inside. It's like gutting a deer with two fingers in the body cavity and the knife edge up in between them, except you have to work the hide loose every step of the way. You need a short drop point for that, and when you get to quartering, the longer the better -- these guys get big, 300 pounds and more.
You just can't do a long smooth cut on the hide from the outside. When I first moved down here, I did that once, and it took the edge right off my Randall Custom Little Bear in no time. It is like cutting 200 grit sandpaper from the front.