DO: Practice mini trips.
Although some dogs gleefully bound into the car, others seem to hate car rides. Before embarking on a vacation with your pet, it is always wise to get him used to moving vehicles.
Start by driving him around a block or two. Reward him each time he manages to stay calm after the short ride.
Gradually prolong the ride. If a blaring siren passes by and he remains calm, reward him immediately with a tiny food treat and praises.