All Ages. The Grinch and his loyal dog, Max, live in a cave on Mount Crumpet, but every year his main source of aggravation comes during Christmastime. This year the Grinch attempts to undermine the annual Christmas celebration at Whoville. With help from Max, and disguised as Santa Claus, he tries to steal Christmas to silence the Whos' holiday cheer for good. Rating: PG. Runtime: 85 minutes.