The best way I know is illegal Im pretty sure. We just let ours run loose for just a few months around the house with plenty of rabbitat nearby, but being sure to mess with them every day so they dont shy away or get to much of a mind of their own. They will take to it naturally if they are much count. Our line will usually be running some by 3-4 months and we will decide on what gets culled around 6 months. I dont like to shock off trash, I prefer catching them on track and giving them a switch but one hunting partner of ours does use shock collars with good luck, I just wasnt raised using shock collars so I dont. I do like pups to run with our older dogs before they are finished but I like to run them with just pups alot too so you can really see what they are doing and make sure they just arent mimicing the older dogs. We have 6 pups right now that are getting close to 6 months old and will be culling one of those to send to a kids home for a pet. It got attacked by a coyote while running a rabbit and just hasnt made much since, the other 5 are running great. I hate to get rid of any of them but we are up to 14 beagles now so I may do more culling.