Another thing that I just thought of if they won't give you anything is to try giving him some pepcid before the trip. I've been giving Storm half a pepcid pill at night to help his tummy so this might also work to help with tummy upset during traveling. I think I'll be giving one to Storm on Sat. morning before his trip to see if it'll help. Since he's so little you'd have to ask what his dose would be and you use the regular strength not the maximum strength. Good luck at the vets.