Richard Gere, Glenn Close and Chris Meloni are all barking mad over their dogs. Those stars and 30 others open up about their love for their canines in “My Dog: An Unconditional Love Story,” making its Hamptons premiere Aug. 23 at Guild Hall. Edie Falco will introduce the film, which features one of the last appearances of the late Lynn Redgrave, whose pooch Viola is now living with Redgrave’s daughter, Annabel.