Ecc. 3:19 is about how animal-man and animal-brute both live and will undergo physical death, hence the part where it says "as one dies, so dies the other". This fact doesn't undo the other fact that only animal-man are made in the image and likeness of God, and given dominion over the animal-brutes (Gen. 1:26-28).
Gen. 2:7 reads that God "[...]breathed upon his face the breath of life [...]". The act of having "breathed the breath of life upon" indicates giving man something. In
Jn. 4:24, we read, "God is Spirit", and thus the "breath of life" is the breath of God which is the soul [a spirit], the soul as life. It is the breath of the Spirit of God that becomes a living spirit in man: God's image and likeness (
Gen. 1:26). This wonderful thing which is a soul, a thing created by God to give man His image and likeness as an unquestionable sign of His Most Holy Paternity, shows signs of the qualities characteristic of Him Who creates it.
It is therefore intelligent, spiritual, free, immortal, and so on, like the Father Who created it. That's why we have reason and morality and they don't. Therefore, animal-brutes don't and couldn't have a soul [spirit] that animal-man has.
I did address points that you made. If you decide to quote and reply to my responses, I'll be here.