You need to find a way to be able to choke the dog. If you want to make the dog unconscious without any medicine, you should try and choke the dog out. For choking the dog, you need to put the bony part of your forearm against the throat of the dog and put pressure on the windpipe of your dog.  Try and maintain this position for at least 30 seconds until you feel the dog is unconscious. If the dog stops struggling, then you can release the position.  You can make your dog unconscious by feeding them a low dosage of valerian root. Valerian root is a natural sedative. It is also available in medical shops in pills or even liquid medicine. It is a better option to consult your dog's doctor before giving them this sedative.