Her name is Carrie, and you should consider her the anti-Miley.
Carrie is a performer with DOGS: The Incredible Dog Show, a touring Puerto Rican act meant to raise awareneness about animal cruelty and to promote adoption.
Carrie, like most of the performers, is a rescue dog. She and the rest of the cast are there to show that dogs can achieve greatness, even from humble beginnings. And just look at that smile.