Labrador Retriever Dog Training – Teaching a dog to run straight This is an additional pile drill that I use that I call “Pile Drill with No Pile”. Normally a pile of bumpers is placed out for the dog to retrieve one at a time. The pile drill is a very good drill and one that certainly should not be omitted. This is an extra drill that I use to get the dog used to retrieving and taking direction with a bumper in his mouth to build more focus to task and to aid in his handling. The training that is done that leads up to this point is done with additional remote retrieve, and remote drop and pick up drills added to the mix.