Dogs get scared in cars for various reasons and sorting through the various causes often requires putting on your investigative hat and turning a bit into a detective. Is your dog anxious of getting inside the car? Does he dread movement? Does he get car sick? Or does he specifically start acting anxious when you make that left turn that brings you straight into the veterinarian's parking lot? In order to better understand the behavior, it therefore helps paying close attention to what seems to trigger your dog's fearful behavior in the car.
Female dogs squat to pee for the same reason women sit on the toilet when they tinkle, unlike men who prefer to stand up. It all boils down to a matter of comfort. However, don't just assume all female dogs squat. In the dog world, there are never black and white scenarios, but lots of shades of grey. You'll therefore occasionally stumble upon the revolutionary female dog who will raise her leg to pee in a male-like fashion.