I started off with 4 boys (brothers) that got on great to start with but as they grew older they started picking on one who was badly injured as a result (hes fine now). The 3 were fine together for 2 years but now Ive had to seperate them so that 2 live together and 2 are on their own. Do you think they are ok to be on their own or do they need friends? Ive introduced other pigs before and it seemed to work fine if the pig being introduced is younger and smaller. I just dont want them to get bored and lonely. What do you think?