Anytime I confront someone who says dogs don't go to Heaven, I have to ask them will Heaven have animals? They have to say "yes" because the bible speaks of them. There will be animals in Heaven. They are part of His original creation, so why would Heaven or the New Earth not include all that was originally created for us in Eden? If you believe there will be no animals in heaven or on the new Earth, you may as well agree there will be no flowers or trees. Now if this God is powerful enough to provide a home for these lions, lambs, horses, and animals of all kinds that you had no relationship with on earth, is he not powerful enough and loving enough to invite your family pet into his kingdom that you did have a close relationship with?
“I go to prepare a place for you” is not just motor and stone, and some nice curtains. Heaven will not lack one thing that will make us truly happy. There will be cold noses and waging tails at the Pearly Gates.