Cross training dogs can be done but I can tell you from experience it's difficult at best. Your dogs have to be pretty high on the intelligence scale. Reason being, if say you have a good red bone coon hound and want to cross train him for hog, you will have the problem of him crossing a coon scent and hitting hot on it rather than staying on a hog scent. I tried cross training a couple of my walker dogs which were prize winning coon hounds and it just didn't work out well. Now if you cross train them from pups it's MUCH easier.

As far as "meant for hogs" goes, the reason Curs are so highly used is their tenacity and strength. They have reasonably good tracking skills, smart, and pretty good foot speed as well as endurance. Just an all around good dog for hogging. There are quite a few other breeds that are okay for hogging such as Walkers (basically a long legged Beagle), Blue Tick, Red Bone, Blue Lacy, Dogo (super strong dog but a bit short on brains), and a few others come to mind but I can't remember the names off hand.