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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
Hopefully this is just a little lethargy from the trip. Given his age and breed, I would want to rule out Addison's. This is where the adrenal glands don't tolerate stress very well. It's very common in standard poodles and now the poodle mixes.
I would at least get an exam and bloodwork. If the electrolytes show abnormalities or the glucose is low, then I'd test for Addison's. If the bloodwork is normal, then it's probably just some lethargy from being over tired. In that case, let her rest and get back to herself.
Here's a nice write up on Addison's with more info:
I hope this helps, let me know if you have any other questions.
If he's still getting up and walking outside and happy, then it can wait. If he's just laying there and won't get up or if his gums look pale or brown as opposed to blue, then I would go in now.