Q. Is the transmigration of souls, and our return in animal forms impossible?
A. Yes. The human soul is essentially an intellectual being, and the nature God has given to man demands a proportionately constructed bodily counterpart. An intellectual soul united with a body incapable of cooperating in thought processes, as, for example, a human soul inhabiting a dog, would be a metaphysically repugnant monstrosity, and a direct contradiction of Divine Wisdom.
Moreover, God has revealed that “it is appointed for man to die once and after that the judgment.” Hebrews 9:27 We do not come back as animals and die again. Also the jusgment of each soul concerns its final destiny, and does not allow of another temporary and earthly existence. So, our returning in animal forms is outside the realm of both possibility and fact.