you might try getting a friend to put scent on a handkerchief or piece of cloth and training your dog to target it or alert by sitting or scratching. start easy and close and have the some other cloths that just you have touched. give the stranger scented one a good rub on their hair, skin, shoes/feet, legs etc so that it's nice and smelly. once your dog will touch or discriminate between targets that smell different from you can start putting them a little further away or in other rooms alone and ask the dog to find them.
you can get this find or seek on verbal cue and go room to room just on the floor, then put them in the open closet etc. you should get to the point where you can point and cue find stranger or find burglar. kill intruder might be more scary for the person that is hiding in the house. :dogwink: training to find, naming the task and getting it on verbal, and using perhaps different friends scents and have them put the fabric in a plastic baggie so you don't get your scent on it.
just some thoughts on how I would do it and have heard a few friends training it. you could also have someone hide but it sort of depends on how your dog will react and if you want him to. if he might bite or attack and you want to perserve any strong response or not injure anyone then don't use a live person.
