Aniston with a pup in 'Marley & Me.' (20th Century Fox) Sometime embattled good girl Jennifer Aniston may have yet another reason to question her self-worth. This week, Pet Sitters International (a trade group for professional pet sitters) awarded Aniston honorary membership based on her role in last year's "Marley & Me" and a poll in which readers selected her as the celebrity they would most like to watch Fido while they're out of town.