The scriptures declare that animals will still exist in the future, even after Christ’s reign begins.
Isaiah 11:6
6The wolf shall dwell with the lamb,
and the leopard shall lie down with the young goat,
and the calf and the lion and the fattened calf together;
and a little child shall lead them.
7The cow and the bear shall graze;
their young shall lie down together;
and the lion shall eat straw like the ox.
8The nursing child shall play over the hole of the cobra,
and the weaned child shall put his hand on the adder’s den.
9They shall not hurt or destroy
in all my holy mountain;
for the earth shall be full of the knowledge of the Lord
as the waters cover the sea.
Ecclesiastes 3:18-22
18I said in my heart with regard to the children of man that God is testing them that they may see that they themselves are but beasts.
19For what happens to the children of man and what happens to the beasts is the same; as one dies, so dies the other.
They all have the same breath, and man has no advantage over the beasts, for all is vanity.[SUP]
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20All go to one place. All are from the dust, and to dust all return.
21Who knows whether the spirit of man goes upward and the spirit of the beast goes down into the earth?
22So I saw that there is nothing better than that a man should rejoice in his work, for that is his lot. Who can bring him to see what will be after him?