Do they get to ride in the car much? If not, then they think they are going to the vet. No wonder they are frightened.
Try taking them on short trips once or even twice a day and then on longer and longer trips. Mine are asleep before we get out of the driveway. Some feel safer in their crates. some love to sleep cuddled in their blankies. Some love pillows. Try a variety to these on the short drives acclimating them to the car. But I'm pretty sure their fear is that they think they are going to the vet. If you can get them over that, all will be well.
They advertise some kind of comforting shirt on TV for fearful dogs that you may want to look into. Can't think of the name. ThunderShirt or something like that. Good luck and be sure to take those short rides, if only to the end of the block for starters.
|