Eu acho que isso é de The Sandman: Dream Country (o terceiro volume eu acho) e a história é chamado: Um sonho de mil gatos.
Dream presents her with a vision of an alternate reality where cats are huge and humans are merely their playthings, tiny servants which groom their bodies and which the cats can kill at their leisure. A man ruined that world by informing the humans that their dreams will shape the world. Enough humans listened to make the vision a reality. Upon waking, the cat undertakes a spiritual quest for justice. She preaches her vision to motley assortments of housecats around the world, hoping that if she can make enough cats believe in and dream of this reality, the world will change to conform to their dreams.