How do hunters ensure their beagles will not get lost and come back? Is there something I can do for fun to explore this side of my beagle?
Well, in my experience, hunters (and farmers) have follow-through. If you are done working or hunting and are back at the pickup and you call the dog and he doesn't come...get in the truck and leave. Most farmers and many local hunters will expect the dog to find it's way home, or will show back up to that spot the next morning. After that, the dogs generally come when called.
ALSO, a dog gets less interested in things when they get tired. A dog running all day is easier to recall than a dog that has just been on the ground for an hour or two.
FINALLY there is what I like to call the 'never before/never again' factor. Take your average show dog or pet dog from some sort of hunting breed. Maybe one time in his life he smells rabbit, duck, or whatever it is that he is bred for. He's going to get really excited and not want to recall. A dog that's been out hunting a dozen times, it knows when it gets recalled that likely you are moving to another hunting spot or something, so there will be more opportunities.