Princess was a dog who made her only appearance in the prank video Angry Grandpa's New Puppy!. She was supposedly owned by Michael and Bridgette but was never seen again after the video.
When Michael and Bridgette present Grandpa is supposed new puppy, he refuses to take it. While Michael and Bridgette leave them for a few hours, the dog had urinated everywhere and chewed up most of the furniture. Grandpa is promised that, if he kisses the dog, it will be taken away. Grandpa does so, but calls the pound regardless. Michael and Bridgette, however, leave in time before the pound can send someone over.