I fostered a pair of nice little rottweiler mix girls, one half shepherd, the other half pit from the look of them, in early 2013. Both got carsick within 3 or 4 miles. Some dogs do, and they do not always outgrow it. Since I will be truck training all my dogs, I just found them homes with someone that had 20 acres and didn't plan on driving with them, they trained to be service dogs for grandma.