Just like you, your dog will need some exercise and stimulation during your journey, and when you get to where you are going. It feels just as good to your canine companion to stretch his legs as it does to you after being cooped up on a car or airplane for several hours. In general, dogs should be walked several times a day, but that is probably not possible when traveling. But as often as you can, stop at a rest area or find a dog park. Give your dog as much time to play as possible. Always keep them on a leash unless there is a sign that specifically marks an off-leash area. When romping outdoors is not possible, chew toys that provide dental benefits and that also deliver food or treats will keep your pup's mind active, as well as its body.
If your pet gets lost while traveling (or while at home), you can improve the odds of his or her safe, quick return by securely fastening an up-to-date ID tag to your dog's collar. Even more secure is a microchip implanted by a veterinarian under your pet's skin. The chip contains important identification details that can usually be tracking online.
The more often you travel with your dog, the easier it will be — on both of you. Take along as many familiar items (dog bed, grooming aids, treats, toys) as is practical. This will give your dog a bit of a sense of well-being even if his or her environment has changed. More tips here on traveling with your dog.