It's a very special day for the Duke and Duchess of Cambridge, and they're celebrating the occasion with the entire family—including their pup!
In honor of their 10-year wedding anniversary, Prince William and Kate Middleton shared an extremely rare video of some of the family's happiest moments together. All of their children, Prince George, Princess Charlotte and Prince Louis, are seen playing with their parents outdoors, but they aren't the only ones featured in this sweet video. If you take a closer look at the footage about five seconds in, you'll notice the family's royal dog quietly walking behind the duchess in the background.