IF the dogs know their job they won't mess with them, not the same scent as a hog.
Maybe it's just coincidence, but I've never seen a hunting dog of any type that was born knowing to hunt a specific animal. Every dog I've ever worked that ended up a keeper in the end was gamey as heck as a pup. It was my job to not only show the dog what I intended him/her to hunt, but also what I DIDN'T want him/her to hunt. Most every young dog I've been around (that hadn't been previously corrected) would chase anything that would run in the woods.
Said nothing about being born knowing it, said know their job. Some dogs know their job at 8 mon., some know at 2yrs. May be a difference in dogs (Curs vs Hounds), training, ect. When you run a young dog with an old dog that does not mess with them there is usually not a problem.
Dogs that trash on other stuff bust Javalinas...
We hunt around them all the time. I have seen other guys' dogs hit a trail right in front of us go in and get tore up while our dogs stayed in the right-away right in front of us. Only run old dogs with his for that reason.
