Submissive dog?

My friend's got a Toy Fox Terrier that is really submissive. Every time we get near her she crouches down and piddles on the floor. It's almost as if she's petrified of us, however she's never been abused. She's going to take her through obedience training, but does anyone know if there's anything she can do to stop it meanwhile. And NO, doggie diapers are not an option. Thanks for everyone's help. If you cannot reply with a serious answer please do not reply at all, thank you.