You are saying a player has to be a herbivore or omnivore? WHAT? Please don’t be that close-minded. I can easily imagine a herding civilization that doesn’t farm plants. There should be a grass analoge just lying around to feed them! Heck, some ants herd aphids and don’t farm plants. A carnivore can become civilized. I’m sorry but I just had to point this out. Also this topic might be a duplicate, I’d have to check.
Edit: yes the topic is a duplicate, and there are three topics on the topic. This one, this one and this one.