Good summary of passages regarding animals. I forget, but suspect the Isaiah passage might be interpretted as referencing the Millenial Reign of Christ on earth. Whereas, the heavenly or third heaven reign is a different issue.
There are quite a few Hebrew passages which in some cases refer to animals and man having life as in Nephesh or a breath of life, but also other Hebrew passages consistent with a tricotomous view of man being body, soul, and spirit.
I don't know of any passages wherein animals are every referenced as being regenerated in the spirit and are discernible from man in that respect, but upon biological death, their bodies return to dust.
Great answer...:) to the point and very enlightening....thank you.