Today marks a very sad day for Anderson Cooper. The CNN star informed his Instagram followers that his longtime pet pooch, a Welsh springer spaniel named Molly, had died. He wrote alongside a photo of the two of them snuggling on a bed together, "An old picture of my sweet dog Molly, who passed away today." Shortly after, Cooper posted another photo paying tribute to his best furry friend showing an up-close shot of the cute-as-can-be canine.