Before you head out, be sure to put flea and tick medicine on your dog (especially if you plan on doing much hiking), and check that it's up to date on vaccinations. You'll want to bring the rabies vaccination certificate along when you go.
You might also consider microchipping your pet, but at the very least, you should ensure that it has a proper collar with identification tags listing several pieces of information. Put your name on there, along with your mobile number and the number of a friend or relative who can be called in case you're not in a coverage area. You should also have a tag that lists the name and number of the campground where you're staying.