Master mockumentarian Christopher Guest (Waiting for Guffman) is at it again with this snarky send-up of canine culture that traverses the galloping neuroses surrounding one highly competitive dog show in Pennsylvania. Talented improvisers Parker Posey, Eugene Levy, Michael McKean and Catherine O'Hara elevate this satire to the stuff of genius. Fans of This Is Spinal Tap, television's "SCTV" -- and dogs, of course -- will find much to love.