"Is it true that your dog will attack YOU if a burglar enters your house and successfully beats the tar out of you? (Said dog thinking, "He [the burglar] must be the new pack leader!")'
That'd be one Quisling of a dog!
Where there is an established pack there is a certain amount of loyalty. Dogs would be useless to one another or to Man if it were otherwise. Also the house is the dogs home too.
A burglar entering my home would have been ripped to pieces just for being on the property. Attacks upon my person by someone outside my family would and did provke savage, all out rage by my dog. I was his main bud as well as the keeper of the electric can opener. We were VERY careful when other people were in our house.
Boyfriends and girlfriends of the family were warned not to grab the arm or try to hold the hand of one of us because that sudden physical contact was all the pretext the dog need to launch his Hound of the Baskervilles routine.
If one member of my family acted as if he or she were attacking another the dog would jump on the attacker. BUT if there was a stranger in the house--anywhere in the house--when one of us acted like we were hitting the other, at the first blow the dog would bolt for the stranger and attack him.
Because ther IS some kind of logic to what animals will do and how they will act, BUT that that logic is only observable rather than actually knowable it is a good idea to treat animal like the animals they are rather than as some kind of 'fellow being of the earth' as these unfortunate people in the chimp story seemed to do.
Nothing personal, but it doesn't sound like your place is a lot of fun to visit...