The first star to arrive on the red carpet at the 77th Cannes Film Festival came on four legs. Messi, the dog from the film “Anatomy of a Fall,” walked up and down the Cannes carpet on Tuesday ahead of the opening ceremony. Justine Triet’s murder mystery “Anatomy of a Fall” last year premiered in Cannes where it went on to win the festival’s top award, the Palme d’Or. Messi — Snoop in the film — won the Palm Dog, a journalist-created prize for the festival’s top dog. (May 14)