Before you make a bad situation worse, the paint that is, feel free to beat the crap out of them, not the dog though, I doubt he had anything to do with it. What type of paint is on your Dart, if it's original, laquer thinner is going to remove your paint too, oven cleaner may as well. Everyone keeps talking about primer, I'm assuming you just want the crap off your paint so let's start there, don't just jump in and really eff it up. If you wet sand, you'll have to buff so you may want to try something else first and work towards more aggressive solutions.