Anyhthing to deter dog theif is a good idea, preventive measures at home, cctv, locks, fencing etc, and loosing a dog must be awfull, if your lucky enough to find who took it and where it is the best thing would be to go and kick his cnut in before taking your dog back. Chips and tattoos will help if your dog finds its way to a kennel/vets etc but i also understand why some don't want there dogs chipped...........