Your dog should wear a buckle collar with his rabies and dog license tags attached, along with your name, address, and phone number. Bring along some of your dog's toys and perhaps a familiar blanket. Unless he travels frequently, he doesn't understand why his world has suddenly been turned upside down, and he may settle more readily with familiar things around him to reassure him. Check your dog for fleas and ticks at the end of each day. Before you stop for the day, plan a rest stop.
Dogs acclimate to a routine very quickly.
If all your rest stops have been three hours apart and your last rest stop was three hours before you stop for the night, when you stop to register, your dog will be VERY ready for HIS rest stop. Registering can often take some time, especially late in the day. If that is not possible, have a family member walk the dog in the designated area while you register. Try to be patient. When you stop at the end of the day, you will be stiff and tired.