beast - image of idolaters, defiled with blood and pollutions, dwelling like dragons, etc., in the wastes of Gentile ignorance: even they shall be converted. Or else, literally, such copious floods of water shall be given by God in the desert, that the very beasts shall (in poetic language) praise the Lord (Psa 148:10) [Jerome].
dragons - “serpents,” or else jackals (see on Isa 13:22).