I don't know what to do about my guinea pig. He is 17 weeks old and at the moment lives in a cage with a grid run attached to it. It is at the side of my computer and he is always running around and popcorning so I'm sure he's happy. The only thing is, would he be happier out in my shed with either a male or get him neutered and get him a girlfriend? I would love to keep him indoors but if I get another hubby says they have to live out in the shed. Which is best, me as a friend living indoors or getting him a guinea friend and put them in the shed. what would you do? If I got another boar how old would it have to be, younger say, 6 weeks or a lot older?