This adaptive training can exercise dog's body and courage, as well, it can avoid dog to be afraid of unfamiliar environment and improve the adaptability of your dog.
In the early training, you can choose a peaceful place, where some fire has been put on the ground. During the time dogs are excited (dusk), take your dog away from the fire first. If the dog don't express adverse reaction, give him a stroke and say "good" to him as reward and encouragement, then take him to be close to the fire gradually. If the dog is afraid, you can distract his mind with food and stroke. When he adapts the fire, you should continue to train him until he adapts firelight fully, finally, take him back.
With dog's familiarity with fire, you can set some fire obstacles for him, such as fire ring or fire hole, and let the dog cross it, which can improve his courage. In the beginning, train him with the fire combined with sound at day, after that, train him ad night, which can improve his anti-jamming capability in the complex conditions.
However, the flame should be small, and you'd better train the dog in the breeze and wet the dog, or your dog may be on fire. As a owner, you should be patient,never beat or scold him. You should induce the dog to train patiently, no matter what.