When should I take my pet to a vet after travel?

Mild lethargy, soft stools, or reduced appetite in the first 24 to 48 hours after a long flight is normal and usually resolves on its own. Contact your vet if any of these symptoms persist beyond three days, if your pet refuses food entirely for more than 72 hours, or if you see vomiting, bleeding, breathing difficulty, or any change you wouldn’t expect.