oh I am so relived to hear about you JR doing that thing in the car because Bentley does the same thing. We call it "Bentley's Dark Side". We thouhgt it was him but it must be a JR trait. Bentley even growls and barks at cars pulling up next to us. And yes he chews, always wants to play and seems to never settle down until night. I was told they have a lot of energy to burn and you have to be up for it. But we love him and I take him out and play Frisbee and throw tennis balls till he can't play anymore and that seems to work. You have to be one step a head of the JR personality. Does your like to watch TV?