[Pavel]

Hi Jeffrey,
this problem is very individual, same like by human. It have nothing to do with
heritage. You can see dogs from one litter and some have this problem and other
not. But mostly is this problem by puppies and by mature dogs is never more.
Basicaly is always better not feeding dog before the trip.
I have this problem too. My Hoky is absolutely without this problem (and has no
problems like puppy as well), Nancy sometimes sick, but mostly, when we driving
some serpentins or something so. But sometimes she is absolutely OK. As I said,
its very individualy.

Pavel