Ultra Litter Attractant works by emitting a scent that naturally attracts cats and kittens to use the litter box. This product is designed for cats that are currently not using their litter boxes. Dr. Elsey's Ultra Litter Attractant is the only litter attractant to provide a clinically tested and consumer proven solution. Mix with Dr. Elsey's Ultra Unscented Clumping Clay Litter for best results.