A small cargo/traveling crate for your pup will help make him feel secure. Yelling will only increase his anxiety. Make sure he's well exercised and tired before you leave...a good long walk and a play session ought to be good. You might want to wait until you arrive at your destination to feed him, many dogs get nauseous during car rides. And for everyone except the driver, ear plugs may come in handy until he settles
.