What you need to do is “good guy-bad guy” training. This type of training will teach your dog to not respond unless you or he is attacked directly and it should improve your overall handling skills as well.
This will be a modified good guy bad guy explanation tailored for your specific posting.
Good Guy bad guy training is all about carefully constructing situations your dog, by his actions, finds intimidating and extinguishing or dampening his response to this stimulus when not paired with a handler signal or command telling him to react. It is about teaching him that not all in the world is bad and getting him to understand he is not in charge of aggressive decision-making.
I have found this useful for Police K9s and Correctional K9s where the dog needs ot be alert and ready but can not and should not react unless directed to do so.
I know of trainers who will tell you that correcting a protection dog for acting out in defense (if it is defense I cant tell without seeing your dog) is wrong…wrong…wrong. Well they are wrong and this type of attitude gravitates toward the mediocrity that persists in much of the dog-training world today.
Increase the window of his response and basically use your authority to override his fear. Lead your dog with confidence that you make the best assessments of a threat.
If this was my dog and he was going postal on anyone who picks up a stick, I would remove my dog from the area and avoid this situation as much as possible until I can train this situation.
Assuming I would not wait more then one day, I would then locate a willing person who will be the Mr. Evil Stick Man.
I now set the stage.
We will use a stick at first since this seems to be the problem. I place maybe 10 sticks on the ground in incremented spaces of 5 feet each and away from my dog. I do this before the helper is even insight.
(0 area) DOG/ME ---10 ft---->(stick)-----(stick)-----(stick)-----(stick)----(stick#10)
I would then go to the 0 area and place my dog into heel position on a wide flat collar connected to a 5 foot leash AND a corrective collar connected to a short 1’ tab leash that sits above the wide flat collar. My left hand is on the leash to the flat collar and my right hand crosses my body to take hold of the short tab leash. With both hands occupied, my dog is pretty secure and by now certain I am placing him under my controlling influence. If he doesn’t he is about to get a wake up call.
I tell my dog to ‘Sit’. No words of encouragement or readiness should be used here. Simply give a command to sit and zip it.
Once all is ready I tell my helper to enter the training area and go to the #10 stick and pick it up. Since there is plenty of distance between the stick man and the dog, he may not even respond to his observation of the “bad guy” that picks up sticks. The helper should drop the stick and walk directly toward the next stick that is 5 feet away but also 5 feet closer to us.
He again picks up a stick and again if no sign of aggression (not even a growl) happens he repeats his actions all the while getting closer and closer to us. At some point your dog will be true to his colors and show an aggressive reaction to this guy.
When he does you should make a mental note of the distance between him and the stick man. This is the area of influence this stimulus (scary stick foragers) have on your dog’s response. It is also more or less a crude working window for you to adjust the stimulus based on the level of aggression your dog has and your level of control over him. Your goal would be to decrease the distance between the dog and the stimulus to a level you feel comfortable.
For me, my dog will need to sit tight next to me under the command of sit with the stick man falling on the ground beating the stick on his body and even taping my dog’s head.
As soon as he makes even a chirp that is clearly aggressive to this otherwise non-aggressive person I give a sharp command to “Quit” or “Quiet” followed by a justified correction.
No one thing I want to mention is that I will do this separate from bite work but during the same training session saving bite work for last and incorporating a command that it is ok to bark aggressive during bite work training.
If you are having a problem with extinguishing a response because it is “not fair”, think about the Hold and Bark and the reason it exist. Look closer and you will see the root of the truth
Good luck
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A dog teaches a boy fidelity, perseverance, and to turn around three times before lying down. - Robert Benchley
In order to really enjoy a dog, one doesn't merely try to train him to be semi-human. The point of it is to open oneself to the possibility of becoming partly a dog. - Edward Hoagland