[twinkie]

When my little chihuahua puppy arrived from his flight he was sooooo stressed as the transfer flight he was supposed to be one was too heavy so he had to wait for the next flight. This turned his 6 hour trip into 10 hours. Anyways, after his first poop he had the non stop runs and would not eat - the stress had flared up his coccidia like 10 times worse than it should have been so I took him to the vet and they kept him a few days (This wasn't my usual vet and I don't think this was necessary and I believe the vet ripped me off).

My other chihuahua got worms as a puppy and these symptoms sound like when she got them. Not eating and vomiting bile.... worming her for a few weeks helped.

I worry all the time about my little ones and I seem to take them to the vet for silly things all the time. Since you've already been to the vet I think your little one might just be stressed from the flight and it is probably just the worms. I am not an expert though so I would keep an eye on him and if he doesn't continue to get better or gets worse I would go back to the vet for sure.