Just Like Yoga
Unlike us, dogs do not just stretch after they wake up. They do so for the sake of their muscles. It can symbolize love and affection as well. When you get home to find your dog stretching, do not think that they just woke up. No, this is a way to show you that they are happy to see you! Aww.
Exposing Their Belly
When your dog shows you their belly, it means that he respects you and feels submissive. Perhaps they also want to play with you. The only way to respond here is to rub their belly! They will want it to happen again and again, so they will keep doing it. However, they also display this behavior when they are getting attacked by some other animal.