[LunarBerry]

I started my girl by using a cozy carrier. I would keep her in it while in the cart most of the time and let her out on the leash for short durations. The first time, she was a bit nervous being in it and didn't like to stay in it for long. She was even a bit motion sick (had to be careful not to sway her carrier too much). But I kept doing it regularly and brought treats for her and fed them to her through the holes. Also took her to mostly fun places, like petsmart (where she got people petting her the first few visits and every since then, she gets excited when people come nearby cause she thinks she's getting pettings) or a park. Then when she was old enough, to her groomers.
Now, she adores her carrier(s) cause she knows she gets to get out of the house and to someplace more interesting. At this point, if I leave her flap closed, she'll get get more upset about being caged in after a while of driving, so what I have started to do was open the flap (and pet her some) and she does much better. I even bought a booster seat, but she's only used that a couple of times and seems to do well, but I think she's used to having the den feel cause she showed signs that she wasn't used to it. There was only one time when the carrier had to be used by one of the other dogs (I had to work and my mom needed to take her girl to the vet) and my mom told me she was livid by not only having her carrier being used by another, but being left home ^^;;; lol