My parents won't let my dog come inside?

My parents won't let my dog come inside. She is outside all the time because she is not potty trained. She is a adult female and gets all the proper care and attention. She is played with CONSTANTLY and is often accompanied with the neighbors dogs as they get along great and love to play and chase each other. I have told them I know how to properly potty train a adult female. She is stubborn and when we tried before it did not work. She is kept warm in the winter, and gets her thick coat trimmed in the summer. In the winter we make sure her water does not freeze over and everything. Plus she has a nice shelter to go in under when she wants to nap, or get away from the weather. Is this okay? And if it is not any way for me to convince them to let her come in?