I own 2 female guinea pigs. I came home one day to find that one of them had a large amount of blood coming out of its ear. There is nothing in the cage that would produce that amount of blood besides the other guinea pig, so I think it would be safe to assume that one attacked the other. I have also noticed their behavior in the past, and they appear to get along some of the time, and they dislike each other at other times.
I don't really have the resources to separate them, and I want them to be able to live together. I am also a busy enough person that I am unable to be around the cage monitoring their behavior constantly. I am not sure if it is possible to train a guinea pig, and if it is, I don't know how to do that.
How can I train my guinea pigs to not attack one another, without being around the cage constantly?