Pre-fall animals were perfect, without blemish, as all creation was, and Death entered the entire creation and began to "devour" the creation. In that sense, Death is a Satan, and has the legal right to "eat" flesh which is "Corruption".
Death is also called Abaddon, the Satan over Sheol and the one who "feeds" Sheol her "food".
Pre-fall, the entire creation was infused with the presence of the Unseen Glory, which Glory departed from the creation when the Adam became defiled, for his defilement made his dominion subject to sin and death, which was separation from perfection, and Corruption/Death began feeding on the entire creation. That is the curse the entire creation became subject to when the Adam sold it into sin and the Glory departed from the creation.
But perfection of the flesh of all creation did not mean that animals did not eat flesh nor did it mean that human beings did not eat animals.
God the Word killed an animal and made tunics to cover the shame of Adam's loss of the Glory and to cover his vanity of being, in that shameful loss and ruin of his body, as the temple for the Glory.
Abel kept sheep. He was a sheepherder. Abel's sheep gave skin for clothing and wool for garments and milk and cheese for eating, but also Lamb for eating.
Before the flood, there were clean animals for eating and for sacrificing and unclean animals which did the dirty work of cleaning the earth.
Noah took seven pair of clean and one pair of unclean, because before the flood, sacrifices were made to God and animals were eaten.
Angels ate calf and goat and drank milk and ate bread with Abraham.
Jesus ate meat after his resurrection and promised to eat Lamb/Ram with the Disciples when they all eat it together in the Kingdom of God -real Lamb or Goat kid at the real Passover celebration.
In the millennial reign, animals will be eaten and sacrificed in God's Kingdom on earth.
In the history book called the Book of Jasher, Abel kept sheep, and Cain ate sheep, which he got from Abel; and Abel got vegetables from Cain.
Book of Jasher Bible - SpeedBible by johnhurt.com
In the fossil record of the flood, animals were caught in the act of eating animals and fish were frozen in mud, which turned to rock, with other fish half in their mouths.
It is Death which is corruption of the flesh and is the eating/devouring of the flesh which entered the creation at the fall, causing the eventual separation from the body of all souls.
It is the spiritual death of the Adam which is called the first death and which is separation from the Father of Glory which Jesus destroyed on the cross, and bought the kingdom back by that blood of Atonement for its future regeneration back, for the Glory.
