A smile can signify anything from happiness and joy to the thoughts of a sly plot seeking revenge on someone. Smiles can be real or fake, and they can often hint towards what others are thinking and how they feel. My absolute favorite type of smile, however, is the smile given out of gratitude. Many people might not realize—and might even deny—the idea of animals smiling, but I have witnessed this kind of smile thousands of times. Every morning, my dogs thank me for bringing them food by wagging their tails rapidly with a huge smile on their face. I love seeing dogs smile, especially the dogs who have been rescued from a bad situation. These are my favorite types of smiles!