[yorkieusa]

He's just a baby and you've had him just a little over a month. He may be experiencing motion sickness as well as the stress of the trip. He should outgrow it. It's not uncommon for them to throw up. The diarrhea is not that common for traveling. I would get him a puppy seat, so he'll be safe, too. Usually, they don't get sick, as long as they can see out. I hope things improve. If not, you might want to consider using Rescue Remedy for pets. It's completely natural.