According to Osho, yes: in the soul’s evolutionary journey we have passed through animal (and even mineral and plant) forms, but once human we do not take birth as an animal again—evolution never retrogresses. We either advance or pause. Past layers persist within us, so animal tendencies can surface under stress; our task is to raise consciousness toward the divine.
Yes—you may have been an animal before, but once you’re human you won’t become an animal again; you just learn to grow up inside and handle your inner “animal” kindly.