Yes, coyote rollers have proved quite good in dealing with crossing the boundaries of your territory. They are actually installed at the top edge of the fence and resist getting space for the animal's paw at the top edge. In this way, wild animals like coyotes could not easily reach the top edge of the fence let alone cross it. These not only prevent the coyotes from crossing the fence but also keep the pets indoors and don't let them pass through the fence from inside.