This will be my final word on the subject...
The Watchtower has always used Adamic sin to explain why God allows all humans to inevitably suffer and die, but this teaching does not explain why animals have always suffered and died.
The Watchtower teaches that whilst humans were meant to live forever, animals have always grown old and died, without even a hope of resurrection.
This seems to contradict their teaching of a loving and caring God, who designed the earth to be a wonderful place for humans and animals to live, a God who only allows his creatures to suffer because of the sin committed by Adam and Eve.
The Watchtower teaches that God originally created the earth as a place of peace and security for mankind, without any threat to humans from predators. Humans would live forever, free of disease and pain. It was only Adamic sin that ended this supposed hope of everlasting life on earth without having to grow old and die.
Yet animals have never had such an idyllic existence, even before Adam and Eve sinned.
Animals have been hunting and killing each other for thousands, if not millions, of years before humans existed.
They have also suffered from disease for many years before humans existed.
A sample of the evidence that animals were suffering from disease (such as arthritis), long before Adamic sin occurred, can be found here:
www.jwfacts.com/watchtower/blog/animals-suffering.php
www.sciencemag.org/news/2016/08/70-million-years-later-duck-billed-dinosaur-has-diagnosis-septic-arthritis
www.dailymail.co.uk/sciencetech/article-2144715/The-dinosaurs-suffered-arthritis-150-million-years-ago--scientists-find.html
www.mirrordaily.com/dinosaur-suffered-from-arthritis/
Even the animals who have been fortunate enough to avoid suffering caused by predators and diseases, have inevitably had to experience the ageing process, hence suffering and death.