We have a 5 yr. old tri-color Cavalier and he is a great traveler. We started traveling with him when he was 10 weeks old. He sleeps on the console between us until he hears the engine noise change or feels us slowing, then he looks up to see where we are.
When we are home, he only barks at deer and bears, but not at small critters like squirrels, rabbits, etc. When we travel, he barks at deer, bears, and chipmonks until we correct him. Then he just stares at them quietly.
He wakes up happy and goes to bed happy and he likes everyone. He is smart, funny and well behaved.
He is the best dog we have ever had!