Join Date: Nov 2003
Sportbike: 01 F4i (Well, I HAD one, anyway)
Years Riding: 7
How you found us: I google myself regularly
In the cabin is no problem. Some airlines (most, actually) still make you pay extra to do that-- it's not as much as in cargo, though. There are several carriers for this and they are all "airline approved" meaning they fit under the seats.... but be warned that only applies to the "test" airlines and so to be really sure you should call your airline and get the exact under-seat dimensions so that the carrier will fit.
Also see your vet early before you go; you will have to provide papers for the dog. The vet can also prescribe a mild sedative and that might help your dog if she's hyper or barky.