Michelle Obama marked Thanksgiving by sharing an adorable photo of her pet dog Sunny at their family home in Washington.RELATED: Michelle Obama sparkles in Christopher John Rogers coat for festive appearanceThe former First Lady took to Instagram to pen the sweet message: "Happy Thanksgiving from Sunny and our entire family! We hope you all have a wonderful day, giving thanks for everyone you love." The snap showed the pet pooch sitting outside in the garden in front of a white wall decorated