Justin...I used the ear or a hock to drag around and that is better...but over the years I just learned that liver works great just to teach the pups to wind and trail...but really it is to see who has the natural ability...I just feed them a few hog ears and meaty hog bones as pups to get them to like hog...I do use hunger as an incentive as well...
Also take pups without grown dogs to woods when 4-5 months old and turn em loose to see who has that natural inclination to want to go make a round in the woods...I look for natural in case I want to breed one of the pups on down the road...
and like Justin is doing...don't have to do it 3 or 4 times a week of 3 months...just 4 or 5 times and that will do in most cases...because either they have it or they don't...about the way I see it...
but as a young man I staged hunts which also included rig hunting where the pups winded off the back of the truck...just let your imagination be your guide...

just don't over do it and burn the pups out...make it fun for them...