Dogs who enjoy car travel need not be confined to a carrier if your car has a restraining harness (available at pet-supply stores and from Saab Cars) or if you are accompanied by a passenger who can restrain the dog. Because most cats are not as comfortable traveling in cars, for their own safety as well as yours, it is best to keep them in a carrier.
Dogs and cats should always be kept safely inside the car. Pets who are allowed to stick their heads out the window can be injured by particles of debris or become ill from having cold air forced into their lungs. Never transport a pet in the back of an open pickup truck.
Stop frequently to allow your pet to exercise and eliminate. Never permit your pet to leave the car without a collar, ID tag, and leash.
Never leave your pet unattended in a parked car. On warm days, the temperature in your car can rise to 120 degrees in a matter of minutes, even with the windows opened slightly. Furthermore, an animal left alone in a car is an open invitation to pet thieves.