Ecc 12:7 Then shall the dust return to the earth as it was: and the spirit shall return unto God who gave it.
Ecc 3:20 All go unto one place; all are of the dust, and all turn to dust again.
Ecc 3:21 Who knoweth the spirit of man that goeth upward, and the spirit of the beast that goeth downward to the earth?
Isa 65:17 For, behold, I create new heavens and a new earth: and the former shall not be remembered, nor come into mind.
When the saints and angels are in the New Jerusalem, the new earth and heaven, the former heaven and earth shall not be remembered, nor come to mind, for it is associated with sin and rebellion.
Animals, pets from earth, will not be in heaven, or the new earth, for if a person knows of their pet in the new earth, they would only know that by knowing about earth, and they will know of the sin and rebellion that took place there.
The saints will not even know their family, and friends, from earth, for they will know nothing prior to the New Jerusalem, which is a place where sin has never been, and sin will never be, and sin and rebellion will never come up again.