"They said"
While it's possible, I seriously doubt we are getting the full story here. For example, I wonder if anyone will have the sense to ask if it is an un-neutered male?
Aw heck, we don't need no stinkin' facts.
I’ve seen some dogs get over protective and aggressive when they get into a car. I’ve also seen dogs that get extremely nervous and agitated by riding in the car. Who knows what set this dog off?
That attitude is so wrong in so many ways. If you have to physically alter a dog so it will not attack the owner it needs to be altered on a much more final basis. Just shoot it in the head or have it put down.
My poor pit bull would never hurt anything or anyone but we have to cut his balls off to make sure we are right.