Try some throw outs with your younger dogs before they hit the woods or an old dog reminder. Collar up and find some deer throw them out on them. _If they attempt anything besides what they should run em back to the box with your zapper. You will probably get more invites if you take the extra time to proof your youngsters. Nobody likes goin with somebody that let's them run whatever without correction due to messing up their hard work with their dogs.
Its easy and works well.
Just try not to have the 22 mag in the truck while your lookin.
x2...if you have access to lots of deer that will work.
I get my pups to baying hogs and then I use deer scent and a cattle prod. I do this about 3 or 4 different times in a two week period and they are usually deer broke before they get in the woods. It is harder to break them once they have started that bad habit.
A refresher course might be needed with the prod but usually not needed.