I'd be very scared that she would get away from your bf, out of your car door and run scared (speaking from experience). Not to mention that while he's trying to grip her she could be injured. No way would I leave them in a car unrestrained, especially when they are anxious. I think restraining your dog to a harness/car seat would actually help her with her issues. I can tell you from experience through training it gets better. It takes a lot of time and patience, and consistency, but they are intelligent animals. Having your pup in a restraint relieves a lot of pressure and anxiety for everyone because you are anticipating an issue and she feeds off that energy. Even when you hand her to your BF and he puts a "hold" on her it's telling her something's up and she reacts. A restraint helps everyone in that situation.
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