Hi,
According to my herbal book animals prone to travel sickness should be fasted for at least 12 hrs before long journeys. At the time of the travel they should be given balls of thick honey, into which a little powdered ginger has been mixed, pressed down their throats; honey will settle the stomach nerves; or yet a better remedy is to mix tree-barks' flour and powdered ginger into the honey, one small teaspoon of flour and a pinch of ginger to one heaped tablespoon thick honey. Dogs travel best on car floors rather than seats if they are bad travellers.