I believe getting away from a caught hog can be trained, but truley rolling out to go get the next one is purely genetic. There are lots of dogs who will leave a caught hog and go hunt again but one who will leave when the catchdog hits is in my opinion a dog who knows there was more hogs in that group and is dead set on catching the rest of them. This type of dog can't be trained, they just are.
X2.. Well said. Most good hog dogs can learn it if they are hunted with other dogs that already will do it. But like T-bob said there are some that are just genetically different and do it naturally. Those are the really special ones!!
If you don't have options of either of those just keep encouraging your dogs to hunt after a caught hog. Push them to hunt even when they are bone tired and you have to walk with them. Eventually with lots of hogs they will learn it. And another small side note, try not to call your dogs out from hunting after a caught hog. Let them work whatever out they want and come back on their own. Sometimes it makes for long waits but it teaches them to not worry about you and focus on finding more hogs
