Man was created to eat meat and so were animals. This concept of "original vegetarianism" isn't true.
Genesis 1:28 And God blessed them, and God said unto them, Be fruitful, and multiply, and replenish the earth, and subdue it: and have dominion over the fish of the sea, and over the fowl of the air, and over every living thing that moveth upon the earth.
Do you know what it means to have dominion over fish? It means to hunt and catch them to eat. It does not mean man captured fish and use them in farming or kept them for pets. A different type of dominion can be had over birds and land animals but in the matter of fish it is easier to understand that it was for hunting and killing for food. It was in the case of the other animals as well but not exclusively as it was for the fish.
God set forth various animals for various duties and purposes. Carnivores are an important aspect of the balance of nature and this is by God's design.
(BBE) But give honour to Christ in your hearts as your Lord; and be ready at any time when you are questioned about the hope which is in you, to give an answer in the fear of the Lord and without pride;