I dont have any exerience with car sickness but it is probably similar to most anxieties, he has related the car with something very bad that he gets himself so worked up on to the point of being sick. I know they say ignore any fearful type behaviour, as they will learn there is nothing to be worried about, if master is not worried. If you reassure him when he wines, he may see this as a positive thing and carry on because you are combating his anxiety and he isnt dealing with it himself. Like you are doing short trips assosciate them with good things, walkies, treats, game of fetch, even go round the block in the car come home, over exaggerate a welcome with the rest of your family lots of cuddles and good boys when he is out of the car. He will soon learn and you will have a happy healthy little boy
I've known quite a few dogs which this has had excellent results on whether assisting in calming for travel or helping at Guy Fawkes etc. Plug-in versions are excellent for indoor use and there are sprays and also collars which assist with travel or anxieties outwith the home 
RR ideally should be dripped onto the nose leather for rapid absorbtion and also to prevent nausea (it's a type of canine brandy so not ideal to give orally in a dog that feels sick).
Personally, having had a dog that has never overcome travelling stresses, I'd be inclined to use a homeopathic remedy and a DAP spray or collar at the same time.
Powered by mwForum 2.12.1 © 1999-2007 Markus Wichitill