When you think about a co-star of Jennifer Aniston, you probably think of some big-shot Hollywood actor. But on Wednesday, Washington’s saw Aniston’s latest co-star: a dog. Marley, the four-legged friend who appears alongside Aniston in the forthcoming film adaptation of the popular book “Marley & Me,” was in town to sponsor rescue dog adoptions with the American Humane Association. (Photo: Carrie Devorah)