Good luck!!
16 hours straight through?? no overnight stop??
wow.
I'd plan on adding many hours onto travel time, to allow for "dog time".
Time for dog to get out, walk around, get some exercise, and take her time peeing and pooping, etc. I'd stop every 2 hours at the longest.
you don't want to hurry the dog during her precious "out of car" time, nor annoy the driver who is there tapping their fingers to get back on road.
I'd bring an item dog is familiar with, like his favorite blankie or your unlaundered sweatshirt for dog to curl up on.
I'd bring plenty of stuff to do, like dog puzzle, kongs,
brand new toys he's never seen before,
and i'd be a little careful about what you feed the dog that day, avoiding fatty or rich foods that day. I'd not feed the dog much at all, really, that day
. I'd rather have a hungry dog
than a puking dog.
I'd keep windows cracked open,
and keep dog facing forward, by open window.
The further back in the car the dog is, the more chance the dog could become queasy. Back of an SUV is great for dogs, though.
If dog starts drooling, yawning excessively, whining, pacing, panting, these could be signs the dog is becoming queasy.
Pulling over and walking dog is very helpful for this.
I'd also call my vet, and ask what she'd like me to give dog, and how much, in event dog does get carsick,
and have that on hand. It's be a long long sad day IF the dog did get carsick.
cuz, it's 16 hours back again, too.
Dont' be blasting the tunes or letting anyone smoke in the car if your dog is in it. Might be good idea to get that all squared away and agreed upon prior to leaving. Lots of cars have option to turn off speakers in the back completely.
I'd also make sure dog is micro-chipped,
and has a dogtag with your cell number or local number where you'll be in LA.
A small flashlight, and a glow in dark dog tag or dog collar might be nice for the nighttime walks on the trip down....or those kind of collars that light up, i mean.
If there is any chance your dog gets out of his collar, i'd walk him in chest harness only.
GOOD LUCK AND HAVE A BLAST!!!!!!!!!!!!!!