It's okay. rabbits eat cardboard boxes and grind their teeth. They have nothing to do to kill time. They don't eat cartons very much. It's nothing. Rabbits are herbivorous vertebrates, belonging to the family Rabbiniformes. The rabbit's head is smaller, slightly longer, its mouth is shorter, its upper lip is longitudinally split, its eyeball is larger, and its expression of eyes varies from species to species.