I have seen that experience too @beckie96830 from comment"I remember one time a dog in my compound sometime in 2011 died of poisoning because it was trying to protect his owner.

An unknown person came to the house and the dog perceived bad vibes from the person and refused to allow him in.

How the stranger got through to the dog is still a mystery to us. We all experienced how the dog spent his last few hours in pains, barking at the top of his voice." but the owner of the dog went far to do an autopsy, he really money to do that.
I enjoyed your post, keep it up.