I know you can't get an exact size, but are most usually able to fly in the cabin? Our breeder is near Sacramento and it's a long drive. I don't want to ship a puppy in the cargo space of a plane, but want to be able to carry her on if possible. Considering I won't hear about said puppy until the end of the month, and then have to wait another 8 weeks!! I am just trying to figure out if I can fly up rather than take a long drive from So. Ca. We figured that it would cost us about the same and we would not be spending all that time driving with a little one.