With a pup it's normally pretty simple mate, I take them to a big field with older dogs and let them run about and Fire the starter pistol behind my back and watch their reaction if they don't seem to be bothered I fire another few and leave it at that the older dogs not being bothered rubs off a hit on the pups and it helps distract them. With an older dog or a dog that's shy it's a bit more complicated but in short find something they like doing like chasing a ball or whatever, distract them with something they like while a mates away a distance and fire the pistol and slowly get closer, som