Hi, I acquired 2 male guinea pigs from a friend as their dcs got bored. They were together from very young and always got on. Unfortunately, before Christmas one of the piggies died and the remaining one has been on his own since. 
He is about 2 now I think, I'm not sure if he would be happier on his own or to try and get a baby boar to introduce him to and hope they get on?
He does seem happy enough, he's an indoor piggie so gets plenty of attention from us but I don't want him to be lonely.
Thanks.