My dog, an Amstaffer, was attacked by a bear.
He had not behaved aggressively towards the bear.
He was standing broadside to the bear, between me and the bear.
He was nor growling, snarling, barking or looking at the bear.
The bear stepped forward and chomped down on my dogs back.
That flipped his 'ON' switch and my dog twisted to defend himself.
In the meantime, I saw an opportunity to save my dog and took it.
As it turned out both myself and the dog were attacking the bear from the same side and in the same area.
In the heat of this battle my dog mistakenly bit my thumb on my weapon hand.
I yelled out, No Sam!, Back Sam! and he disappeared while I continued to focus on the bear.
The battle went in my favor and after it ended I looked for my dog and saw him standing about 8 feet away.
In the heat of a life-or-death battle, he still heard, listened to, and obeyed me.
He activated his OFF switch
You can see him here in the top of the photo, that is where he had gone to and remained on my 'Back!'command.
You might want to keep this in mind before making categorical posts about the lack of an OFF switch.
Have a Nice Day