I know this thread is kind of old, but I just had to chime in here. I agree with what others have said about herding dogs. I have an Australian Cattle Dog (Blue Heeler) and while he personally has some issues in the car, I wouldn't travel with any other breed. They are fiercely loyal, versatile dogs who can keep up with you no problem. They are also extremely protective of their owners which is really nice when traveling.
We also travel with a Pit Bull, which are equally nice dogs, however the problem with Pit Bulls is the prejudice most place and people hold towards them. A lot of cities in the U.S. have banned them, and some places are so strict (Denver) that they will take your dog away imediatly and put it to sleep, even if you're simply passing through the city! There's a lot of places I haven't seen yet because of this. I'll wait until after she's passed away.
Are you sure about pitbulls being put to sleep like that? I want a pitt like nothing else and im skeptical.
And what kind of things do dogs keep you from doing? Some are obvious like catching on the fly or getting in gondolas (im assuming). But like do they keep their head down oon 53s... Yknow. Its not as obvious to me as youd think
I might make a thread about this
I wish I was joking. Google Pit Bulls and BSL. Denver, CO is the most ruthless and the one that will take your dog and have it euthanized even if you're only passing through (http://www.huffingtonpost.com/2009/10/07/denver-pit-bull-ban-distu_n_313171.html) , but there's lots of other cities around the U.S. that have a ban on them as well. Miami Dade is another really bad one. There's absolutely nothing wrong with Pit Bulls at all. They tend to be more dog aggressive then most breeds as a result of their fighting history, but their temperament is wonderful with people given they are socialized the right way.