I had to give one of my 3 guinea pigs back to the pet shop a few days ago. Two of them were fighting viciously, one was a bully and I think the other just had enough. The bully caused a minor head wound to the other but the day after, the bullied pig damn-near took his eye out (profuse bleeding from the eye). I would like to have thought I could have kept them but I don't think it would have ever worked out. I was sad to see him go and I'm not sure if I acted in his best interests. 