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My name is***** I have been a small animal veterinarian for 13 years and I'd like to help with your question.
In general, we really advise not giving any sedation to dogs for airline flights. Sedation decreases their ability to regulate their body temperature and control blood pressure. Given the changes in temperature during travel and changes in altitude, it can make air travel even more dangerous for them. However, sometimes it is unavoidable.
However, when I do have to give them a sedative, I wouldn't use valium. It is unpredictable in the way it effects dogs and it doesn't last long enough. I like to use Xanax if I have to use anything. It works well, lasts long and is relatively safe. If you are flying you will need a health certificate. The veterinarian who signs the health certificate should be able to prescribe some Xanax.
I hope that helps, but it you have additional questions let me know.
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