Jack and Victor decide to become dog sitters and enlist the help of computer-savvy Isa to register them on the 'Pets Home From Home' website. Meanwhile Isa limbers up for the Craiglang Bake Off and locks whisks with local cake rival, Peggy. Utterly determined to beat the reigning baking champion, Isa strong-arms her pals into becoming reluctant cake-tasting guinea pigs.