Scripture says there will be animals in heaven, so there is that.
If you are referring to the passage in Isaiah it is not referring to heaven .
What it speaks to specifically is to the period of the Kingdom
on earth when Christ defeats His enemies & rules the earth from the "Holy Mountain" of Jerusalem and the earth is returned to the state God originally made it .
Heaven not having an earth or a sea by the way.
Having prayed for this coming Kingdom on earth yourself I would think you should be aware of this .
Isa 11:1-9
And there shall come forth a rod out of the stem of Jesse, and a Branch shall grow out of his roots.....
But with righteousness shall he judge the poor,
and reprove with equity for the meek of the earth: and he shall smite the earth with the rod of his mouth, and with the breath of his lips shall he slay the wicked......
And righteousness shall be the girdle of his loins, and faithfulness the girdle of his reins.
The 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.......
And the cow and the bear shall feed; their young ones shall lie down together: and the lion shall eat straw like the ox.
And the sucking child shall play on the hole of the asp, and the weaned child shall put his hand on the cockatrice' den.
They 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.