Do All Dogs Go to Heaven? What Calvin Thinks

It is then indeed meet for us to consider what a dreadful curse we have deserved, since all created things in themselves blameless, both on earth and in the visible heaven, undergo punishment for our sins; for it has not happened through their own fault, that they are liable to corruption. Thus the condemnation of mankind is imprinted on the heavens, and on the earth, and on all creatures. It hence also appears to what excelling glory the sons of God shall be exalted; for all creatures shall be renewed in order to amplify it, and to render it illustrious.

But he means not that all creatures shall be partakers of the same glory with the sons of God; but that they, according to their nature, shall be participators of a better condition; for God will restore to a perfect state the world, now fallen, together with mankind. But what that perfection will be, as to beasts as well as plants and metals, it is not meet nor right in us to inquire more curiously; for the chief effect of corruption is decay. Some subtle men, but hardly sober-minded, inquire whether all kinds of animals will be immortal; but if reins be given to speculations where will they at length lead us? Let us then be content with this simple doctrine, — that such will be the constitution and the complete order of things, that nothing will be deformed or fading. - John Calvin, commenting on Romans 8:21