Thank you for writing.
Anyone can try to justify killing an animal because animals were killed in the Bible, but none of this is in the creation or heavenly intent of God; it is all part of this fallen world.
Food animals are not put to sleep like companion animals. They suffer horrible deaths and the vast majority suffer all of their lives. What you propose only happens in a dream world, and not in reality.
The only way to truly be compassionate and kind to animals is to be a vegan.
In the Love of the Lord,
Frank and Mary