Anyone coursing wolves with Irish Wolfhounds would be wise to have several in case they encounter a pack. An IW can easily handle a wolf one-on-one but not an entire pack. An IW is a more robust dog than the borzoi - taller and quite a bit heavier but not as fast or agile.
I wonder if it would be legal to course wolves in Idaho or Montana where it is legal to hunt them? Probably limited to harvesting them with a firearm or bow. I hear that strychnine works really well.
As to coursing, laws in most states are pretty specific as to what you can use dogs for. Birds aside, you can't use dogs to break deer, but I believe you still can some places in the south. You can use dogs for bear. I'd be surprised if they could be used for wolves, or even coyotes, anywhere.