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The best treatment that I have seen for anxiety is a medication called Trazodone. I dose in the 2-8 mg per kg body weight range 1-3 times daily, as needed.
For travel sickness, you can pick up Meclizine over the counter and give 12.5 or 25 mg once 30 minutes before travel. I go with 12.5 in small dogs and 25 mg in medium to larger dogs.
I hope this helps, let me know if you have any other questions.
You're welcome, happy to help.