As a Christian, my understanding is founded in the revelations therein. We are told that the soul dies when the individual does, be it animal or human.
We are also told that the spirit returns to God. Jesus and Stephen both said when they died something that may be understood as, "receive my spirit:"
Stephen: Acts 7:59 . . .receive my spirit. . .
Jesus: John 19:30 . . .he delivered up [his] spirit.
Luke 23:46 . . .“Father, into your hands I entrust my spirit.. . .
Matthew 27:50 50 Again Jesus cried out with a loud voice, and yielded up [his] spirit.
While I have an
idea of what the spirit is based on scripture, it seems that there might be more to it than I understand at present.
Here then we have you use the word 'soul' which I cannot since scripture clearly tells us it dies. I can, however, use the word 'spirit' about man's spirit that God shapes and receives back upon death of that individual.