Káu (ha̍k-miâ: Canis lupus familiaris(kha-ni-suh lu-tu-suh hoa-mi-li-a-li-suh)), ā-sī kóng káu-á, sī Káu-kho tōng-bu̍t tang-tiong chi̍t khoán 普遍 lo̍h-sèng ê lūi, sī lông (Canis lupus) ê a-chéng.