Animals were not created to live forever.
2 Pet. 2:12 But these men, like unreasoning animals that act on instinct and are born to be caught and destroyed, speak abusively about things of which they are ignorant. They will suffer destruction brought on by their own destructive course, 13 suffering harm as their reward for their own harmful course.
Human suffering is different from animal problems and natural phenomena. Only the human couple was created in the image of God, with consciousness and intellectual qualities.
Gen. 1:27 And God went on to create the man in his image, in God’s image he created him (...)
Given that human nature is also carnal like that of animals (Gen. 6:3), humans must follow the instructions of his spiritual Father to avoid the suffering that the flesh could bring to him as it does to animals.
Jude 10 But these men are speaking abusively about all the things they really do not understand. And in all the things that they do understand by instinct like unreasoning animals, they go on corrupting themselves.
When the first couple decided to deviate from the direction of their spiritual Father, they brought suffering to themselves and their descendants. That is why those who in their imperfect nature decide not to follow God's advice put themselves in the same position as animals that were created to eventually die.
We humans have the hope of eternal life, that our Father will forever fix the problem we inherited from our first human parents. He already paid a great price so that the foundations for the rescue of human nature were universally established. He did this by allowing his perfect spiritual Son to be sacrificed as a human, so that we all have now the opportunity to benefit from that hopeful arrangement by striving to demonstrate to God that we desire to benefit from His help. In any case, everything that is harmful to God's earthly creation will be swept away very soon.