Hm. I admit to not really knowing much on this matter. I did recently watch "My Big Redneck Wedding" on CMT. One of the husbands was into "hog hunting." They went along with him on a hunt. They had a group of hounds that they released, which found the hogs but did not kill them or really visably hurt them. The guys then ran in, lassoed up the hogs, and put them into a truck. I assumed that they would then be taken for slaughter as any other food animal, not used for dog/hog fighting.
It thus seemed to me, to be similar to cowboys, riding into their semi-wild cattle herds to round up cattle. Seemed like a way for humans to more-easily capture their wild livestock. Please do correct me if I am wrong.