Just when you thought there was no way to spin a fresh zombie story, along comes Fido. Set in a Canadian suburb during the 1950s, the movie boasts a delicious premise: What if humans were the victors in a zombie war, and now the living dead — fit with dog collars to zap their cannibal instincts — were turned into domestic slaves? Hey, zombie, mow that lawn. Housewife Helen, played with inspired silliness by Matrix diva Carrie-Anne Moss, persuades her wimp hubby (Dylan Baker) to get the family its own rotting corpse. Lonely son Timmy (K’Sun Ray) calls his new pal Fido. As played by Scottish comic Billy Connolly, Fido is a good doggie until he gets his collar off. Then, oh boy! Director Andrew Currie is better at laughs than scares, but he can’t sustain either as Fido runs out of steam in the final stretch. Till then, it’s fiendish fun.