The key word there is "sport". I repeat, I have no problem with the legitimate use of a dog as a hunting partner.
I see absolutely no need for a sport where a hog who has already undergone capture once is then turned loose in a confined area to be attacked by dogs for the amusement of the audience. You've already admitted they suffer. What's humane about intentionally putting them through it?
And FYI, I feed live and I hunt. I just don't shoot fish in a barrel.