hunting what? you wanting it to go to ground ,bushing or ratting
i wouldnt start a dog ratting till about 9 month old , try and get some where with plenty of rats your dog will probably want to kill rats most terriers do
bushing most terriers will do any way ,they just seem to pick it up.
going to ground me personally i wouldnt start one till about 18 month old give or take a couple of month but everyones differant .. and easiest way is to let it watch on digs ,then see what happens