God saw fit to create animals in the beginning and said they were good. I see no reason why that pattern would not continue on into the Millennium and Final State.
Isaiah 11
5And righteousness shall be the girdle of his loins, and faithfulness the girdle of his reins.
6The wolf also shall dwell with the lamb, and the leopard shall lie down with the kid; and the calf and the young lion and the fatling together; and a little child shall lead them.
7And the cow and the bear shall feed; their young ones shall lie down together: and the lion shall eat straw like the ox.
8And the sucking child shall play on the hole of the asp, and the weaned child shall put his hand on the cockatrice' den.
9They shall not hurt nor destroy in all my holy mountain: for the earth shall be full of the knowledge of the LORD, as the waters cover the sea.