Pertinent story to the subject... a mnth ago I actually went deer hunting on the property we've dogged for the last 2 yrs.... now no one shoots hogs on this property, so the only fear these hogs have are of being dogged...
I got in my treestand and got settled... meanwhile, my buddy was getting in his stand on the far side of the property(up wind of me)... moments later it was like a stampede of swine
.... first a small boar came streaking by... visibly scared out of his mind...then a pack of 5, then 3 more.... and these hogs weren't just trotting... they were hauling ass.... straight line, headed for the next county!
All this, from just winding a guy getting into his stand... "smell a man, hear a bark... dog's gonna be chewing on my ass shortly... I better get the heck outa' here!
" ....sound or smells, they learn real quick what's up.