Make sure to carry all the essentials your pet needs, as there is no knowing when you may come across supplies while on the road. Carry first aid, collars, leashes, water bottles and bowls, toys, and a litter tray in the case of a cat. Bring along a spare pillow or blanket for them to sprawl on inside the car when out of their crate. As a safety precaution, schedule a visit with your vet for a pre-travel checkup.