I haven’t read all the posts here, so forgive me if this has been mentioned before. Somewhere in CS Lewis’s writing he discusses the interesting idea that animals who have had a close and loving bond with humans (ie pets) might be, is some mysterious way, “ensouled” so that they might greet us in Heaven. He admits it is pure conjecture - there is no mention of this in Scripture, and by far our biggest concern is with our own, and other human souls - but it is something to mull over, at the very least. Of course he put it much better than I ever could.
There is also that mention of not only a “new Heaven” but also of a “new Earth”. Who knows what this might mean. But it seems at least possible that creatures that Almighty God cared enough to create and nourish over their short lives, might also have a place in the final things.