Hogs are tough. I shot one with a 125 thunderhead a few years ago on public land. I stalked up on them as when I drew on this sow, she turned to face me at 10 yards. I thought I would just shot her between the eyes. At the shot she took off, so I knew a didn't hit here between the eyes, but I got a blood trail that I quicly lost.
The next morning I went back, and got into the same group of pigs about a hundred or so yards from where I shot her. There were two other public hunters stalking the same bunch and they were about 40 yeads closer than I was, and they got a shot before I did. The hogs scattered, and I saw one heading down a fence row. I rushed to cut it off at a gap in the fence that I knew was ahead of it. When it got there, I could tell that it was one the guy had gut shot as it was slowing down and guts were hanging out. I could also tell it was the same spotted sow I had shot at the evening before.
I shot at the running sow as she went by, and missed. It turned down a mowed lane, and I followed it to where it bayed up in a weed thicket (almost the exact same place where I had shot it the evening before). I shot it again, but it was still not giving up.
By this time the other two public hunters had followed her blood trail to where I could see them, and I called them over. I told them the hog they had shot was in the weeds there, and I had shot it again, but it wasn't dead yet. The guy pulled a big knife and thought he was going to finish her with it, but I told he better think again. After she rushed him couple of times, he decided to shoot her again.
By this time, there were so many holes and blood, I could not tell where I had shot her the evening before. I told him I had shot her the evening before, and lost her in this same spot. He went ahead and took the hog. I saw him on the area again about a week later, and he told me he had found my thunderhead when he cleaned the hog. It had went to the left of her head and into the shoulder and broken the arrow off about an inch from the broadhead. The broadhead was between the ribs and the shoulder when he went to cut off the shoulder.
He said when he shot her that morning, there was no sign she had even been hit before. Hogs are just tough.